diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index e669ac900c66accae33feddaa97554b9ffefede0..49086f5e75fd87294208ffe423cd87cc26232ced 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -86,7 +86,7 @@ extern const int32_t TYPE_BYTES[16];
 #define TSDB_DEFAULT_USER               "root"
 #define TSDB_DEFAULT_PASS               "taosdata"
 
-#define TSDB_PASS_LEN                   128
+#define TSDB_PASS_LEN                   129
 
 #define SHELL_MAX_PASSWORD_LEN          TSDB_PASS_LEN
 #define TSDB_TRUE   1