diff --git a/Library/Homebrew/test/.bundle/config b/Library/Homebrew/test/.bundle/config
index dcf3d1c4cf..e451829e9a 100644
--- a/Library/Homebrew/test/.bundle/config
+++ b/Library/Homebrew/test/.bundle/config
@@ -1,3 +1,3 @@
 ---
 BUNDLE_PATH: "../vendor/bundle"
-BUNDLE_DISABLE_SHARED_GEMS: '1'
+BUNDLE_DISABLE_SHARED_GEMS: "true"