diff --git a/reactos/include/psdk/basetsd.h b/reactos/include/psdk/basetsd.h
index 62158488596..15bc7c1a816 100644
--- a/reactos/include/psdk/basetsd.h
+++ b/reactos/include/psdk/basetsd.h
@@ -1,9 +1,11 @@
 #ifndef _BASETSD_H
 #define _BASETSD_H
 
+#ifndef _M_AMD64
 #if !defined(__ROS_LONG64__)
 #ifdef __WINESRC__
-//#define __ROS_LONG64__
+#define __ROS_LONG64__
+#endif
 #endif
 #endif
 
diff --git a/reactos/include/psdk/winnt.h b/reactos/include/psdk/winnt.h
index 89a9871cd45..80f7d3b54f4 100644
--- a/reactos/include/psdk/winnt.h
+++ b/reactos/include/psdk/winnt.h
@@ -1,9 +1,11 @@
 #ifndef _WINNT_H
 #define _WINNT_H
 
+#ifndef _M_AMD64
 #if !defined(__ROS_LONG64__)
 #ifdef __WINESRC__
-//#define __ROS_LONG64__  <- hack of fail!!!
+#define __ROS_LONG64__
+#endif
 #endif
 #endif