diff --git a/cpp/src/arrow/ipc/.gitignore b/cpp/src/arrow/ipc/.gitignore
index 8150d7efe33..b2ddb055dcb 100644
--- a/cpp/src/arrow/ipc/.gitignore
+++ b/cpp/src/arrow/ipc/.gitignore
@@ -1 +1 @@
-*_generated.h
\ No newline at end of file
+*_generated.h
diff --git a/cpp/src/plasma/format/.gitignore b/cpp/src/plasma/format/.gitignore
new file mode 100644
index 00000000000..b2ddb055dcb
--- /dev/null
+++ b/cpp/src/plasma/format/.gitignore
@@ -0,0 +1 @@
+*_generated.h