diff --git a/devices/buffered_display.h b/devices/buffered_display.h
index 4658470..b13ff18 100644
--- a/devices/buffered_display.h
+++ b/devices/buffered_display.h
@@ -26,6 +26,8 @@
 #ifndef AVRLIB_DEVICES_BUFFERED_DISPLAY_H_
 #define AVRLIB_DEVICES_BUFFERED_DISPLAY_H_
 
+#include <string.h>
+
 #include "avrlib/base.h"
 #include "avrlib/log2.h"
 #include "avrlib/op.h"