diff --git a/reactos/include/ndk/halfuncs.h b/reactos/include/ndk/halfuncs.h
index 23ff47e993a..a20b1d1c2f9 100644
--- a/reactos/include/ndk/halfuncs.h
+++ b/reactos/include/ndk/halfuncs.h
@@ -55,6 +55,8 @@ Author:
 // The DDK steals these away from you.
 //
 #ifdef _MSC_VER
+void __cdecl _enable(void);
+void __cdecl _disable(void);
 #pragma intrinsic(_enable)
 #pragma intrinsic(_disable)
 #endif