diff --git a/src/proto.h b/src/proto.h
index 7e6b67a..191ecd8 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -47,10 +47,12 @@
    typedef int LPBOOL;
 #  include "os_win16.pro"
 #  include "os_mswin.pro"
+#  include "winclip.pro"
 # endif
 # ifdef WIN3264
 #  include "os_win32.pro"
 #  include "os_mswin.pro"
+#  include "winclip.pro"
 #  if (defined(__GNUC__) && !defined(__MINGW32__)) \
 	|| (defined(__BORLANDC__) && __BORLANDC__ < 0x502)
 extern int _stricoll __ARGS((char *a, char *b));