diff --git a/tests/tsim/src/simMain.c b/tests/tsim/src/simMain.c
index 6a9d96bc3b2e6056c73fad73b1fa9f1b7dee6cbf..7d74c62c7daf391fed1bf1afac233f51b84c8f0b 100644
--- a/tests/tsim/src/simMain.c
+++ b/tests/tsim/src/simMain.c
@@ -35,7 +35,7 @@ int32_t main(int32_t argc, char *argv[]) {
 
   for (int32_t i = 1; i < argc; ++i) {
     if (strcmp(argv[i], "-c") == 0 && i < argc - 1) {
-      tstrncpy(configDir, argv[++i], MAX_FILE_NAME_LEN);
+      tstrncpy(configDir, argv[++i], 128);
     } else if (strcmp(argv[i], "-f") == 0 && i < argc - 1) {
       strcpy(scriptFile, argv[++i]);
     } else if (strcmp(argv[i], "-a") == 0) {
@@ -75,4 +75,4 @@ int32_t main(int32_t argc, char *argv[]) {
   simInfo("execute result %d", ret);
 
   return ret;
-}
\ No newline at end of file
+}