diff --git a/src/common/dosyacc.c b/src/common/dosyacc.c
index 14672306db..802a8045ca 100644
--- a/src/common/dosyacc.c
+++ b/src/common/dosyacc.c
@@ -1,3 +1,5 @@
+/* include platform.h first to get __WIN32__ definition */
+#include "wx/platform.h"
 #if defined(__WIN32__) || defined(__GNUWIN32__)
 /* all Win32 compilers can handle C++ comments, and C++ comments
    is the only C++ in setup.h */