diff --git a/src/common/inc/tname.h b/src/common/inc/tname.h
index 213aef1bd8c7301acb4be4fc75a0f1d2943b948d..5c2948db763ed97535d5d1027fe283ca96724d92 100644
--- a/src/common/inc/tname.h
+++ b/src/common/inc/tname.h
@@ -25,7 +25,7 @@ void extractTableName(const char *tableId, char *name);
 
 char* extractDBName(const char *tableId, char *name);
 
-int32_t tableIdPrefix(const char* pDb, char* prefix, int32_t len);
+size_t tableIdPrefix(const char* pDb, char* prefix, int32_t len);
 
 void extractTableNameFromToken(SStrToken *pToken, SStrToken* pTable);
 
diff --git a/src/common/src/tname.c b/src/common/src/tname.c
index b86a0ad1d083dfe871a15a32180f26c521b0935f..5c351edf48e10ff3176f38a177142f0f394ee5bd 100644
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@@ -39,7 +39,7 @@ char* extractDBName(const char* tableId, char* name) {
   return strncpy(name, &tableId[offset1 + 1], len);
 }
 
-int32_t tableIdPrefix(const char* name, char* prefix, int32_t len) {
+size_t tableIdPrefix(const char* name, char* prefix, int32_t len) {
   tstrncpy(prefix, name, len);
   strcat(prefix, TS_PATH_DELIMITER);
 
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 1505f16812de817d37c629173bb366b7c9a49744..ad50b4929c3d15a9851dd81dcc5cff7210a1c821 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1736,7 +1736,7 @@ static int32_t mnodeDoCreateChildTable(SMnodeMsg *pMsg, int32_t tid) {
     STagData *pTagData = (STagData *)pCreate->schema;  // it is a tag key
 
     char prefix[64] = {0};
-    int32_t prefixLen = tableIdPrefix(pMsg->pDb->name, prefix, 64);
+    size_t prefixLen = tableIdPrefix(pMsg->pDb->name, prefix, 64);
     if (0 != strncasecmp(prefix, pTagData->name, prefixLen)) {
       mError("msg:%p, app:%p table:%s, corresponding super table:%s not in this db", pMsg, pMsg->rpcMsg.ahandle,
              pCreate->tableId, pTagData->name);