diff --git a/include/wx/chkconf.h b/include/wx/chkconf.h
index 1ea7d95e19..8d36d10b0c 100644
--- a/include/wx/chkconf.h
+++ b/include/wx/chkconf.h
@@ -641,7 +641,7 @@
 #endif /* !defined(wxUSE_HTML) */
 
 #ifndef wxUSE_LIBMSPACK
-#   ifndef __UNIX__
+#   if !defined(__UNIX__) || defined(__WXPALMOS__)
         /* set to 0 on platforms that don't have libmspack */
 #       define wxUSE_LIBMSPACK 0
 #   else