diff -Naur mp3splt-gtk-0.9.2/src/ui_manager.c mp3splt-gtk-0.9.2-p/src/ui_manager.c
--- mp3splt-gtk-0.9.2/src/ui_manager.c	2014-05-10 16:48:59.000000000 +0200
+++ mp3splt-gtk-0.9.2-p/src/ui_manager.c	2019-06-07 02:04:15.721146613 +0200
@@ -182,7 +182,7 @@
     g_vsnprintf(formatted_message, 1024, message, ap);
     va_end(ap);
 
-    fprintf(stderr, formatted_message);
+    fprintf(stderr, "%s", formatted_message);
     fflush(stderr);
   }