diff --git a/filters/all.js b/filters/all.js
index b68290da..5d194dc3 100644
--- a/filters/all.js
+++ b/filters/all.js
@@ -134,7 +134,7 @@ filter.trimLastChar = trimLastChar;
 
 function convertOpertionIdToMiddlewareFn(operationId) {
   const capitalizedOperationId = operationId.charAt(0).toUpperCase() + operationId.slice(1);
-  return "register" + capitalizedOperationId + "Middleware";
+  return `register${  capitalizedOperationId  }Middleware`;
 }
 filter.convertOpertionIdToMiddlewareFn = convertOpertionIdToMiddlewareFn;