diff --git a/lib/core/LLVMCG/BaseGen.py b/lib/core/LLVMCG/BaseGen.py
index d29f5ea..9ab6bb6 100644
--- a/lib/core/LLVMCG/BaseGen.py
+++ b/lib/core/LLVMCG/BaseGen.py
@@ -1209,6 +1209,9 @@ class BaseGenMixin:
         return func
 
     def _mangle_func_name(self, name: str, module_name: str | None = None) -> str:
+        if name in self._export_extern_funcs:
+            # extern def 一律使用裸名（C/Win32 符号不加模块 SHA1 前缀）
+            return name
         if name in self._export_funcs and not module_name:
             return name
         if name in self._export_extern_funcs: