diff --git a/activesupport/test/core_ext/module/concerning_test.rb b/activesupport/test/core_ext/module/concerning_test.rb
index 9137eccacb..c6afbe537c 100644
--- a/activesupport/test/core_ext/module/concerning_test.rb
+++ b/activesupport/test/core_ext/module/concerning_test.rb
@@ -72,7 +72,7 @@ class ModuleConcernTest < ActiveSupport::TestCase
       end
     end
 
-    concerning :Baz, prepend:true do
+    concerning :Baz, prepend: true do
       module ClassMethods
         def will_be_orphaned_also; end
       end