diff --git a/rederr.c b/rederr.c
index 622f42b..97fed01 100644
--- a/rederr.c
+++ b/rederr.c
@@ -11,6 +11,7 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <sys/poll.h>
 #include <sys/signal.h>