diff --git a/src/main-executable/main.c b/src/main-executable/main.c
index cded24cd..bae82e6a 100644
--- a/src/main-executable/main.c
+++ b/src/main-executable/main.c
@@ -11,6 +11,10 @@
 #include <stdio.h>
 #include <sys/stat.h>
 
+#ifndef DEFFILEMODE
+#define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)/* 0666*/
+#endif
+
 GtkWidget *window;
 
 // standard Gtk Application stuff, more or less