diff --git a/tools/bit/print.cpp b/tools/bit/print.cpp
index 35feda1..8bc6f16 100644
--- a/tools/bit/print.cpp
+++ b/tools/bit/print.cpp
@@ -17,6 +17,7 @@
 #include "print.h"
 
 #include <sys/ioctl.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <unistd.h>