diff --git a/Library/Homebrew/extend/os/linux/dev-cmd/update-test.rb b/Library/Homebrew/extend/os/linux/dev-cmd/update-test.rb
index 121b29f83e..e64d1522b9 100644
--- a/Library/Homebrew/extend/os/linux/dev-cmd/update-test.rb
+++ b/Library/Homebrew/extend/os/linux/dev-cmd/update-test.rb
@@ -8,6 +8,7 @@ module Homebrew
 
   def git_tags
     tags = generic_git_tags
-    Utils.popen_read("git tag --list | sort -rV") if tags.blank?
+    tags = Utils.popen_read("git tag --list | sort -rV") if tags.blank?
+    tags
   end
 end