diff --git a/.gitignore b/.gitignore
index 9dc4eb8dbc..be800c3ea3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,9 @@
 /Library/PinnedTaps
 /Library/Taps
 
+# Ignore vendored files within `Library`
+/Library/Homebrew/vendor/portable-ruby/*
+
 # Ignore `bin` contents (again).
 /bin
 
diff --git a/Library/Homebrew/vendor/portable-ruby-version b/Library/Homebrew/vendor/portable-ruby-version
new file mode 100644
index 0000000000..633c00da36
--- /dev/null
+++ b/Library/Homebrew/vendor/portable-ruby-version
@@ -0,0 +1 @@
+2.0.0-p648