diff --git a/source/blender/gpu/gawain/shader_interface.c b/source/blender/gpu/gawain/shader_interface.c
index b2218d07493..22c45dec86f 100644
--- a/source/blender/gpu/gawain/shader_interface.c
+++ b/source/blender/gpu/gawain/shader_interface.c
@@ -11,6 +11,7 @@
 
 #include "shader_interface.h"
 #include <stdlib.h>
+#include <stddef.h>
 
 #define DEBUG_SHADER_INTERFACE 0