diff --git a/mingw-w64-crt/crt/crt_handler.c b/mingw-w64-crt/crt/crt_handler.c
index 6571e69..fe52cf4 100644
--- a/mingw-w64-crt/crt/crt_handler.c
+++ b/mingw-w64-crt/crt/crt_handler.c
@@ -40,7 +40,7 @@
 int __mingw_init_ehandler (void);
 extern void _fpreset (void);
 
-#if defined(__x86_64__) && !defined(_MSC_VER)
+#if defined(__x86_64__) && !defined(_MSC_VER) && !defined(__SEH__)
 EXCEPTION_DISPOSITION __mingw_SEH_error_handler(struct _EXCEPTION_RECORD *, void *, struct _CONTEXT *, void *);
 
 #define MAX_PDATA_ENTRIES 32
diff --git a/mingw-w64-crt/crt/crtdll.c b/mingw-w64-crt/crt/crtdll.c
index 6187f10..0d97702 100644
--- a/mingw-w64-crt/crt/crtdll.c
+++ b/mingw-w64-crt/crt/crtdll.c
@@ -148,7 +148,9 @@
 static WINBOOL __DllMainCRTStartup (HANDLE, DWORD, LPVOID);
 
 WINBOOL WINAPI DllMainCRTStartup (HANDLE, DWORD, LPVOID);
+#if defined(__x86_64__) && !defined(__SEH__)
 int __mingw_init_ehandler (void);
+#endif
 
 WINBOOL WINAPI
 DllMainCRTStartup (HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved)
@@ -157,7 +159,7 @@
   if (dwReason == DLL_PROCESS_ATTACH)
     {
       __security_init_cookie ();
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__SEH__)
       __mingw_init_ehandler ();
 #endif
     }
diff --git a/mingw-w64-crt/crt/crtexe.c b/mingw-w64-crt/crt/crtexe.c
index b730dc4..c3deb6e 100644
--- a/mingw-w64-crt/crt/crtexe.c
+++ b/mingw-w64-crt/crt/crtexe.c
@@ -200,7 +200,7 @@
 
 int mainCRTStartup (void);
 
-#ifdef _WIN64
+#if defined(__x86_64__) && !defined(__SEH__)
 int __mingw_init_ehandler (void);
 #endif
 
@@ -282,7 +282,7 @@
     
     _pei386_runtime_relocator ();
     __mingw_oldexcpt_handler = SetUnhandledExceptionFilter (_gnu_exception_handler);
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__SEH__)
     __mingw_init_ehandler ();
 #endif
     _set_invalid_parameter_handler (__mingw_invalidParameterHandler);