diff --git a/vnpy/api/okexfuture/OkexFutureApi.py b/vnpy/api/okexfuture/OkexFutureApi.py
index 9d9809e8..905a3258 100644
--- a/vnpy/api/okexfuture/OkexFutureApi.py
+++ b/vnpy/api/okexfuture/OkexFutureApi.py
@@ -413,7 +413,7 @@ class OkexFutureRestClient(OkexFutureRestBase):
 
     #----------------------------------------------------------------------
     @staticmethod
-    def errorCode2String(code):
+    def errorCodeToString(code):
         assert code in errorCodeMap
         return errorCodeMap[code]