diff --git a/mingw-w64-crt/crt/tlssup.c b/mingw-w64-crt/crt/tlssup.c
index 475ccd8..249bedd 100644
--- a/mingw-w64-crt/crt/tlssup.c
+++ b/mingw-w64-crt/crt/tlssup.c
@@ -64,11 +64,17 @@
 static __CRT_THREAD TlsDtorNode dtor_list_head;
 #endif
 
+extern int _CRT_MT;
+
 BOOL WINAPI
 __dyn_tls_init (HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved)
 {
   _PVFV *pfunc;
 
+  /* We don't let us trick here.  */
+  if (_CRT_MT != 2)
+   _CRT_MT = 2;
+
   if (dwReason != DLL_THREAD_ATTACH)
     {
       if (dwReason == DLL_PROCESS_ATTACH)