diff --git a/include/caosdb/handler_interface.h b/include/caosdb/handler_interface.h
index ee38b38225dda6a903c89a239384ea96b2847c07..f5d77f86c35fe60edbd088afd235ed7ba633c69c 100644
--- a/include/caosdb/handler_interface.h
+++ b/include/caosdb/handler_interface.h
@@ -57,7 +57,7 @@ namespace caosdb::transaction {
 
 const static std::string logger_name = "caosdb::transaction";
 /*
- * Baseclass for UnaryRpcHandler, DownloadRequestHandler and 
+ * Baseclass for UnaryRpcHandler, DownloadRequestHandler and
  * UploadRequestHandler
  *
  * It handles a request: Its status is contained in the transaction_status
@@ -72,12 +72,12 @@ public:
 
   virtual void Start() = 0;
 
-	/*
-	 * ok indicates whether the current request is in a good state or not. If 
-	 * ok is false, the request will be ended.
-	 *
-	 * returns false if the handler is done
-	 */
+  /*
+   * ok indicates whether the current request is in a good state or not. If
+   * ok is false, the request will be ended.
+   *
+   * returns false if the handler is done
+   */
   virtual bool OnNext(bool ok) = 0;
 
   virtual void Cancel() = 0;