diff --git a/src/storage/src/util.cc b/src/storage/src/util.cc
index cbccb24ca3..8c6d8bc346 100644
--- a/src/storage/src/util.cc
+++ b/src/storage/src/util.cc
@@ -394,7 +394,7 @@ int delete_dir(const char* dirname) {
     if (0 == ret) {
       continue;
     }
-    snprintf(chBuf, sizeof(256), "%s/%s", dirname, ptr->d_name);
+    snprintf(chBuf, sizeof(chBuf), "%s/%s", dirname, ptr->d_name);
     ret = is_dir(chBuf);
     if (0 == ret) {
       // is dir