diff --git a/tools/shell/src/shellArguments.c b/tools/shell/src/shellArguments.c
index 8368837cc4..1eb61d2394 100644
--- a/tools/shell/src/shellArguments.c
+++ b/tools/shell/src/shellArguments.c
@@ -311,7 +311,7 @@ static void shellInitArgs(int argc, char *argv[]) {
       if (strlen(argv[i]) == 2) {
         printf("Enter password: ");
         taosSetConsoleEcho(false);
-        if (scanf("%20s", shell.args.password) > 1) {
+        if (scanf("%128s", shell.args.password) > 1) {
           fprintf(stderr, "password reading error\n");
         }
         taosSetConsoleEcho(true);