diff --git a/tools/bus.c b/tools/bus.c
index 9e4fc73..542f03e 100644
--- a/tools/bus.c
+++ b/tools/bus.c
@@ -4,6 +4,7 @@
 
 
 
+#include <string.h>
 #include "drivers/bus.h"
 
 #include "drivers/bus/tty.c"