diff --git a/config/asset_injector.css.remove_column_negative_margins.yml b/config/asset_injector.css.remove_column_negative_margins.yml
index 9fa9b02..a98ef57 100644
--- a/config/asset_injector.css.remove_column_negative_margins.yml
+++ b/config/asset_injector.css.remove_column_negative_margins.yml
@@ -14,7 +14,7 @@ code: |-
   }
 
   .columns:last-child {
-  	margin-bottom-0;
+  	margin-bottom: 0;
   }
 media: all
 preprocess: true