diff --git a/sys/winnt/win32api.h b/sys/winnt/win32api.h
index 2b63c8005..b4dc7e4c8 100644
--- a/sys/winnt/win32api.h
+++ b/sys/winnt/win32api.h
@@ -17,6 +17,13 @@
 
 #define WIN32_LEAN_AND_MEAN
 
+#undef Protection /* We have a global name space collision.  No source file
+                     using win32api.h should be using the Protection macro
+                     from youprop.h.
+                     A better fix would be to ensure we include all window
+                     header files before we start clobbering the global name
+                     space with NetHack specific macros. */
+
 #include <windows.h>
 #include <commctrl.h>
 
diff --git a/win/win32/winMS.h b/win/win32/winMS.h
index 4160f93d8..e34cb006f 100644
--- a/win/win32/winMS.h
+++ b/win/win32/winMS.h
@@ -20,6 +20,13 @@
 #endif
 #endif
 
+#undef Protection /* We have a global name space collision.  No source file
+                     using win32api.h should be using the Protection macro
+                     from youprop.h.
+                     A better fix would be to ensure we include all window
+                     header files before we start clobbering the global name
+                     space with NetHack specific macros. */
+
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <commctrl.h>