diff --git a/acconfig.h b/acconfig.h
index b3df8c6f0d..72918fca30 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -2,8 +2,10 @@
 /*                                                                         */
 /* Version: $Id$                                                           */
 
-#ifndef __GTKSETUPH__
-#define __GTKSETUPH__
+/* This define (__WX_SETUP_H__) is used both to insure setup.h is included 
+ * only once and to indicate that we are building using configure. */
+#ifndef __WX_SETUP_H__
+#define __WX_SETUP_H__
 
 #ifdef __GNUG__
     #pragma interface
@@ -611,4 +613,4 @@
 
 @BOTTOM@
 
-#endif /* __GTKSETUPH__ */
+#endif /* __WX_SETUP_H__ */
diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp
index ac6f482ae0..8ccb8710db 100644
--- a/src/common/zstream.cpp
+++ b/src/common/zstream.cpp
@@ -29,9 +29,9 @@
 
 // When using configure, the path must be "zlib.h" I don't know
 // what other ports (wxMac, wxMotif without configure) need here.
-// If we are building with ./configure, we trust the zlib path is 
-// given as a -I option. (confusingly configure defines __GTKSETUPH__)
-#if defined(__WXMSW__) && !defined(__GTKSETUPH__)
+// If we are building with configure (defines __WX_SETUP_H__), 
+// we trust the zlib path is given as a -I option.
+#if defined(__WXMSW__) && !defined(__WX_SETUP_H__)
    #include "..\zlib\zlib.h"
 #else
    #include "zlib.h"