diff --git a/intern/cycles/util/util_image_impl.h b/intern/cycles/util/util_image_impl.h
index 3429ee46e94..58f85cf93d6 100644
--- a/intern/cycles/util/util_image_impl.h
+++ b/intern/cycles/util/util_image_impl.h
@@ -17,6 +17,7 @@
 #ifndef __UTIL_IMAGE_IMPL_H__
 #define __UTIL_IMAGE_IMPL_H__
 
+#include "util_algorithm.h"
 #include "util_debug.h"
 #include "util_image.h"