diff --git a/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.directive.ts b/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.directive.ts
index 1871b3329a..16d0c4ab0d 100644
--- a/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.directive.ts
+++ b/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.directive.ts
@@ -116,7 +116,7 @@ export class WorkPackageEditFieldController {
 
   public set editable(enabled:boolean) {
     this._editable = enabled;
-    this.$element.toggleClass('-editable', enabled);
+    this.$element.toggleClass('-editable', !!enabled);
   }
 
   public shouldFocus() {