diff --git a/buildkite.sh b/buildkite.sh
index b2710719..662e1e1a 100755
--- a/buildkite.sh
+++ b/buildkite.sh
@@ -103,6 +103,7 @@ projects=(
     "vibe-d/vibe.d+vibe-core-base" # 4m31s
     # https://github.com/vibe-d/vibe.d/issues/2157
     "vibe-d/vibe.d+libasync-base" # 3m45s
+    "dlang/phobos" # 4m50s
     "sociomantic-tsunami/ocean" # 4m49s
     "dlang/dub" # 3m55s
     "vibe-d/vibe-core+epoll" # 3m38s
diff --git a/buildkite/build_project.sh b/buildkite/build_project.sh
index c6aeb9fa..af24d88c 100755
--- a/buildkite/build_project.sh
+++ b/buildkite/build_project.sh
@@ -37,11 +37,18 @@ case "$REPO_URL" in
         ;;
 esac
 
+# Don't checkout a tagged version of the core repostories like Phobos
+case "$REPO_FULL_NAME" in
+    dlang/phobos)
+        ;;
+    *)
+
 echo "--- Cloning the ${REPO_URL} (tag: $latest_tag)"
 git clone -b "${latest_tag}" --depth 1 "${REPO_URL}" "${REPO_DIR}"
-
 cd "${REPO_DIR}"
 
+esac
+
 
 use_travis_test_script()
 {
@@ -212,6 +219,17 @@ case "$REPO_FULL_NAME" in
         make -j2 ldc2
         ;;
 
+    dlang/phobos)
+        "$DIR"/clone_repositories.sh
+        # To avoid running into "Path too long" issues, see e.g. https://github.com/dlang/ci/pull/287
+        export TMP="/tmp/${BUILDKITE_AGENT_NAME}"
+        export TEMP="$TMP"
+        export TMPDIR="$TMP"
+        rm -rf "$TMP" && mkdir -p "$TMP"
+        cd phobos && make -f posix.mak -j2 buildkite-test
+        rm -rf "$TMP"
+        ;;
+
     aliak00/optional)
         dub test "--compiler=$DC"
         ;;