diff --git a/mingw-w64-crt/intrincs/ilockcxch2.c b/mingw-w64-crt/intrincs/ilockcxch2.c
new file mode 100644
index 0000000..1385c36
--- /dev/null
+++ b/mingw-w64-crt/intrincs/ilockcxch2.c
@@ -0,0 +1,12 @@
+#include <intrin.h>
+
+#ifdef _WIN32
+__LONG32 __stdcall InterlockedCompareExchange(__LONG32 volatile *Destination, __LONG32 ExChange, __LONG32 Comperand);
+
+__LONG32 __stdcall InterlockedCompareExchange(__LONG32 volatile *Destination, __LONG32 ExChange, __LONG32 Comperand)
+{
+  __LONG32 prev;
+  __asm__ __volatile__("lock ; cmpxchgl %1,%2" : "=a" (prev) : "q" (ExChange),"m" (*Destination), "0" (Comperand) : "memory");
+  return prev;
+}
+#endif