--- netsurf-2.9/framebuffer/font_internal.c
+++ netsurf-2.9/framebuffer/font_internal.c
@@ -18,6 +18,7 @@
  */
 
 #include <inttypes.h>
+#include <string.h>
 
 #include <assert.h>
 #include "css/css.h"