diff --git a/lib/Support/Windows/DynamicLibrary.inc b/lib/Support/Windows/DynamicLibrary.inc
index 95d7ba1699f..241f95d55a9 100644
--- a/lib/Support/Windows/DynamicLibrary.inc
+++ b/lib/Support/Windows/DynamicLibrary.inc
@@ -41,7 +41,7 @@ using namespace sys;
 
 static DenseSet<HMODULE> *OpenedHandles;
 
-extern "C" static BOOL CALLBACK
+static BOOL CALLBACK
 ELM_Callback(WIN32_ELMCB_PCSTR ModuleName, ULONG_PTR ModuleBase,
              ULONG ModuleSize, PVOID UserContext) {
   OpenedHandles->insert((HMODULE)ModuleBase);