diff --git a/include/wx/setup_gccxml.h b/include/wx/setup_gccxml.h
index 908ecdfad0..090e0169c5 100644
--- a/include/wx/setup_gccxml.h
+++ b/include/wx/setup_gccxml.h
@@ -148,7 +148,7 @@
 #endif
 
 
-#define WXWIN_COMPATIBILITY_2_6 0
+#define WXWIN_COMPATIBILITY_2_6 1
 
 #define WXWIN_COMPATIBILITY_2_8 1