diff --git a/src/common/classes/locks.h b/src/common/classes/locks.h
index 01b3f194c2..ee8a81befb 100644
--- a/src/common/classes/locks.h
+++ b/src/common/classes/locks.h
@@ -119,7 +119,7 @@ public:
 	void leave()
 	{
 #ifdef DEV_BUILD
-		if ((DWORD)spinlock.OwningThread != GetCurrentThreadId())
+		if ((U_IPTR)spinlock.OwningThread != GetCurrentThreadId())
 			DebugBreak();
 #endif
 		LeaveCriticalSection(&spinlock);