diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index e9cb5bb..b6cbb15 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -3138,6 +3138,8 @@
         if not os.path.exists(path) and os.path.exists(path + ".py"):
           path = path + ".py"
         spec = importlib.util.spec_from_file_location("device_specific", path)
+        if not spec:
+          raise FileNotFoundError(path)
         logger.info("loaded device-specific extensions from %s", path)
         module = importlib.util.module_from_spec(spec)
         spec.loader.exec_module(module)