diff --git a/src/lj_err.c b/src/lj_err.c
index 414ef477..b0ceaa2f 100644
--- a/src/lj_err.c
+++ b/src/lj_err.c
@@ -239,12 +239,6 @@ typedef struct UndocumentedDispatcherContext {
 /* Another wild guess. */
 extern void __DestructExceptionObject(EXCEPTION_RECORD *rec, int nothrow);
 
-#if LJ_TARGET_X64 && defined(MINGW_SDK_INIT)
-/* Workaround for broken MinGW64 declaration. */
-VOID RtlUnwindEx_FIXED(PVOID,PVOID,PVOID,PVOID,PVOID,PVOID) asm("RtlUnwindEx");
-#define RtlUnwindEx RtlUnwindEx_FIXED
-#endif
-
 #define LJ_MSVC_EXCODE		((DWORD)0xe06d7363)
 #define LJ_GCC_EXCODE		((DWORD)0x20474343)