diff --git a/src/common/src/texpr.c b/src/common/src/texpr.c
index e3959455212d1de131cea2d44b22085713004945..60ed368418969555e838164ddcb255c464c16ea6 100644
--- a/src/common/src/texpr.c
+++ b/src/common/src/texpr.c
@@ -1457,7 +1457,8 @@ int32_t exprValidateTimeNode(char *msgbuf, tExprNode *pExpr) {
       }
 
       //time unit
-      if (child1->nodeType != TSQL_NODE_VALUE &&
+      if (child1->nodeType != TSQL_NODE_VALUE ||
+          child1->resultType != TSDB_DATA_TYPE_TIMESTAMP ||
           child1->pVal->nType != TSDB_DATA_TYPE_TIMESTAMP) {
         return TSDB_CODE_TSC_INVALID_OPERATION;
       }