diff --git a/src/jsony.nim b/src/jsony.nim
index 871dcb6..6d77d46 100644
--- a/src/jsony.nim
+++ b/src/jsony.nim
@@ -736,7 +736,7 @@ proc dumpHook*(s: var string, v: string) =
       s.dumpStrFast(v)
 
 template dumpKey(s: var string, v: string) =
-  const v2 = v.toJson() & ":"
+  const v2 = jsony.toJson(v) & ":"
   s.add v2
 
 proc dumpHook*(s: var string, v: char) =