diff --git a/src/common/src/tname.c b/src/common/src/tname.c
index aeade05df27c48c4a7d5f76c71be824ff0336c22..40433d1f002db90a16b5c48f63f14afc7dcda2b3 100644
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@@ -74,7 +74,7 @@ SColumnFilterInfo* tFilterInfoDup(const SColumnFilterInfo* src, int32_t numOfFil
       size_t len = (size_t) pFilter[j].len + 1 * TSDB_NCHAR_SIZE;
       pFilter[j].pz = (int64_t) calloc(1, len);
 
-      memcpy((char*)pFilter[j].pz, (char*)src[j].pz, pFilter[j].len);
+      memcpy((char*)pFilter[j].pz, (char*)src[j].pz, (size_t) pFilter[j].len);
     }
   }