diff --git a/layer-selector.c b/layer-selector.c
index b077c48..13b0e45 100644
--- a/layer-selector.c
+++ b/layer-selector.c
@@ -23,6 +23,7 @@
 #include <glib.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 static GtkWidget *global_load_button;
 static GtkWidget *global_save_button;