diff --git a/camlibs/stv0680/bayer.c b/camlibs/stv0680/bayer.c
index 2c98e4e17..32a36d63f 100644
--- a/camlibs/stv0680/bayer.c
+++ b/camlibs/stv0680/bayer.c
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <math.h>
+#include <stdlib.h>
 #include "bayer.h"
 
 /* Enhanced by Kurt Garloff to do scaling and debayering at the same time. */