--- a/src/uni-utils.c	2018-11-19 13:22:27.611236686 +0100
+++ b/src/uni-utils.c	2018-11-19 13:29:36.577474931 +0100
@@ -21,6 +21,7 @@
  */
 
 #include "uni-utils.h"
+#include <stdlib.h>
 
 /**
  * uni_pixbuf_scale_blend: