diff --git a/metagpt/tools/search_engine.py b/metagpt/tools/search_engine.py
index 7c463605c..767f4aaba 100644
--- a/metagpt/tools/search_engine.py
+++ b/metagpt/tools/search_engine.py
@@ -88,7 +88,7 @@ class SearchEngine(BaseModel):
             run_func = importlib.import_module(module).DDGAPIWrapper(**kwargs).run
         elif self.engine == SearchEngineType.CUSTOM_ENGINE:
             run_func = self.run_func
-        elif self.engine == SearchEngineType.Bing:
+        elif self.engine == SearchEngineType.BING:
             module = "metagpt.tools.search_engine_bing"
             run_func = importlib.import_module(module).BingAPIWrapper(**kwargs).run
         else: