diff --git a/src/kit/shell/src/shellImport.c b/src/kit/shell/src/shellImport.c
index 222d69e854933095ec0aadaa8a67bf1c19954c3b..38abb423cfd2c0329dad24244a798f0617b4cbb6 100644
--- a/src/kit/shell/src/shellImport.c
+++ b/src/kit/shell/src/shellImport.c
@@ -210,7 +210,7 @@ static void shellSourceFile(TAOS *con, char *fptr) {
     /* free local resouce: allocated memory/metric-meta refcnt */
     taos_free_result(pSql);
 
-    memset(cmd, 0, MAX_COMMAND_SIZE);
+    memset(cmd, 0, tsMaxSQLStringLen);
     cmd_len = 0;
   }