diff --git a/source/blender/radiosity/intern/source/radpostprocess.c b/source/blender/radiosity/intern/source/radpostprocess.c
index 0422a8f6c2c..74b72e3cab6 100644
--- a/source/blender/radiosity/intern/source/radpostprocess.c
+++ b/source/blender/radiosity/intern/source/radpostprocess.c
@@ -41,6 +41,7 @@
  *************************************** */
 
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
 
 #ifdef HAVE_CONFIG_H