diff --git a/tools/deps_guard/elf_file_mgr/module_info/compile_info_loader.py b/tools/deps_guard/elf_file_mgr/module_info/compile_info_loader.py
index 623d20dfba8d53a3449f4fa9d90a0eb7ce06f89d..a8968a06c9bb9c4de3e2c5fe2463de07cd7cbcae 100755
--- a/tools/deps_guard/elf_file_mgr/module_info/compile_info_loader.py
+++ b/tools/deps_guard/elf_file_mgr/module_info/compile_info_loader.py
@@ -72,9 +72,10 @@ class CompileInfoLoader(object):
 
         if len(unknown_items) > 0:
             print("%d modules has no component info" % len(unknown_items))
-            with open(os.path.join(product_out_path, "unknown.json"), "w") as f:
-                res = json.dumps(unknown_items, indent=4)
-                f.write(res)
+            with os.fdopen(
+                    os.open(os.path.join(product_out_path, "unknown.json"), os.O_WRONLY | os.O_CREAT, mode=0o640),
+                    "w") as f:
+                json.dump(unknown_items, f, indent=4)
 
         # init platformsdk, chipsetsdk, innerapi flags
         CompileInfoLoader.__set_elf_default_value(load_mgr)