diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index 8d53436111..660b9b3a3c 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -187,7 +187,7 @@ module Superenv
       paths << Formula["llvm"].opt_lib.to_s
     end
 
-    paths << homebrew_extra_library_paths
+    paths += homebrew_extra_library_paths
     PATH.new(paths).existing
   end