diff --git a/reactos/lib/3rdparty/mingw/tlssup.c b/reactos/lib/3rdparty/mingw/tlssup.c
index 1c32d0d62a6..70fdc6ba224 100644
--- a/reactos/lib/3rdparty/mingw/tlssup.c
+++ b/reactos/lib/3rdparty/mingw/tlssup.c
@@ -99,6 +99,7 @@ BOOL WINAPI
 __dyn_tls_init (HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved)
 {
   _PVFV *pfunc;
+  uintptr_t ps;
 
 #ifndef _WIN64
   if (_winmajor < 4)
@@ -135,8 +136,11 @@ __dyn_tls_init (HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved)
       return TRUE;
     }
 
-  for (pfunc = &__xd_a + 1; pfunc != &__xd_z; ++pfunc)
+  ps = (uintptr_t) &__xd_a;
+  ps += sizeof (uintptr_t);
+  for ( ; ps != (uintptr_t) &__xd_z; ps += sizeof (uintptr_t))
     {
+      pfunc = (_PVFV *) ps;
       if (*pfunc != NULL)
 	(*pfunc)();
     }