diff --git a/0.10/Dockerfile b/0.10/Dockerfile
index 2fdbf69661..8714624b86 100644
--- a/0.10/Dockerfile
+++ b/0.10/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:jessie
 ENV NODE_VERSION 0.10.44
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/0.10/slim/Dockerfile b/0.10/slim/Dockerfile
index f0ccd17826..79a8fde7d3 100644
--- a/0.10/slim/Dockerfile
+++ b/0.10/slim/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:jessie-curl
 ENV NODE_VERSION 0.10.44
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/0.10/wheezy/Dockerfile b/0.10/wheezy/Dockerfile
index 5067393535..45b74fef92 100644
--- a/0.10/wheezy/Dockerfile
+++ b/0.10/wheezy/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:wheezy
 ENV NODE_VERSION 0.10.44
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/0.12/Dockerfile b/0.12/Dockerfile
index cb37da1e28..30627f2683 100644
--- a/0.12/Dockerfile
+++ b/0.12/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:jessie
 ENV NODE_VERSION 0.12.13
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/0.12/slim/Dockerfile b/0.12/slim/Dockerfile
index f95ef50ee7..bb70314818 100644
--- a/0.12/slim/Dockerfile
+++ b/0.12/slim/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:jessie-curl
 ENV NODE_VERSION 0.12.13
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/0.12/wheezy/Dockerfile b/0.12/wheezy/Dockerfile
index f1904db8d5..c3a1aecaf0 100644
--- a/0.12/wheezy/Dockerfile
+++ b/0.12/wheezy/Dockerfile
@@ -3,17 +3,17 @@ FROM buildpack-deps:wheezy
 ENV NODE_VERSION 0.12.13
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/4.4/Dockerfile b/4.4/Dockerfile
index 37770c4593..3bea7e34ae 100644
--- a/4.4/Dockerfile
+++ b/4.4/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 4.4.3
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/4.4/slim/Dockerfile b/4.4/slim/Dockerfile
index e7fea290a7..212c4efe6a 100644
--- a/4.4/slim/Dockerfile
+++ b/4.4/slim/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 4.4.3
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/4.4/wheezy/Dockerfile b/4.4/wheezy/Dockerfile
index d23808fb6b..b35a4d3d34 100644
--- a/4.4/wheezy/Dockerfile
+++ b/4.4/wheezy/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 4.4.3
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/5.11/Dockerfile b/5.11/Dockerfile
index 0295acf579..c2a9db5d6b 100644
--- a/5.11/Dockerfile
+++ b/5.11/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 5.11.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/5.11/slim/Dockerfile b/5.11/slim/Dockerfile
index 8b211dae78..412846265d 100644
--- a/5.11/slim/Dockerfile
+++ b/5.11/slim/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 5.11.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/5.11/wheezy/Dockerfile b/5.11/wheezy/Dockerfile
index 85806b8b07..d073867253 100644
--- a/5.11/wheezy/Dockerfile
+++ b/5.11/wheezy/Dockerfile
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 5.11.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/Dockerfile-slim.template b/Dockerfile-slim.template
index 661d110bfa..0eb30491ee 100644
--- a/Dockerfile-slim.template
+++ b/Dockerfile-slim.template
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 0.0.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/Dockerfile-wheezy.template b/Dockerfile-wheezy.template
index c7291b17a7..92217509c5 100644
--- a/Dockerfile-wheezy.template
+++ b/Dockerfile-wheezy.template
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 0.0.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done
 
diff --git a/Dockerfile.template b/Dockerfile.template
index 8ba74ffe4b..2ecbdc2e8c 100644
--- a/Dockerfile.template
+++ b/Dockerfile.template
@@ -4,17 +4,17 @@ ENV NPM_CONFIG_LOGLEVEL info
 ENV NODE_VERSION 0.0.0
 
 # gpg keys listed at https://github.com/nodejs/node
-RUN set -ex \
-  && for key in \
-    9554F04D7259F04124DE6B476D5A82AC7E37093B \
+ENV NODE_GPG_KEYS 9554F04D7259F04124DE6B476D5A82AC7E37093B \
     94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
     0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93 \
     FD3A5288F042B6850C66B31F09FE44734EB7990E \
     71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
     DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
     B9AE9905FFD7803F25714661B63B535A4C206CA9 \
-    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
-  ; do \
+    C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8
+
+RUN set -ex \
+  && for key in $GPG_KEYS; do \
     gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
   done