diff --git a/demos/gtk-demo/listview_colors.c b/demos/gtk-demo/listview_colors.c
index b7a5c567fa..bc01d83eaf 100644
--- a/demos/gtk-demo/listview_colors.c
+++ b/demos/gtk-demo/listview_colors.c
@@ -11,6 +11,8 @@
 
 #include <gtk/gtk.h>
 
+#include <stdlib.h>
+
 #define GTK_TYPE_COLOR (gtk_color_get_type ())
 G_DECLARE_FINAL_TYPE (GtkColor, gtk_color, GTK, COLOR, GObject)
 
diff --git a/demos/gtk-demo/listview_settings.c b/demos/gtk-demo/listview_settings.c
index 3e86e18346..e5908047b3 100644
--- a/demos/gtk-demo/listview_settings.c
+++ b/demos/gtk-demo/listview_settings.c
@@ -9,6 +9,8 @@
 
 #include <gtk/gtk.h>
 
+#include <stdlib.h>
+
 /* Create an object that wraps GSettingsSchemaKey because that's a boxed type */
 typedef struct _SettingsKey SettingsKey;
 struct _SettingsKey