diff --git a/setup.h.in b/setup.h.in
index c238900902..92ab6db4ec 100644
--- a/setup.h.in
+++ b/setup.h.in
@@ -103,7 +103,6 @@
 #undef __WINDOWS__
 #endif
 
-#undef __WIN95__
 #ifndef __WIN32__
 #undef __WIN32__
 #endif