diff --git a/config.example.json b/config.example.json
index ff5aaf47..45cd95a9 100644
--- a/config.example.json
+++ b/config.example.json
@@ -46,7 +46,7 @@
             "passwd": "",
             //is_fast: false by default, if it is true, the client is faster but user can't call
             //any synchronous interface of it.
-            is_fast: false,
+            "is_fast": false,
             //connection_number: 1 by default, valid only if is_fast is false.
             "connection_number": 1
         }
diff --git a/drogon_ctl/templates/config.csp b/drogon_ctl/templates/config.csp
index ff5aaf47..45cd95a9 100644
--- a/drogon_ctl/templates/config.csp
+++ b/drogon_ctl/templates/config.csp
@@ -46,7 +46,7 @@
             "passwd": "",
             //is_fast: false by default, if it is true, the client is faster but user can't call
             //any synchronous interface of it.
-            is_fast: false,
+            "is_fast": false,
             //connection_number: 1 by default, valid only if is_fast is false.
             "connection_number": 1
         }