diff --git a/rw/rw.c b/rw/rw.c
index a8e062e4..4308e73b 100644
--- a/rw/rw.c
+++ b/rw/rw.c
@@ -33,6 +33,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
+#include <strings.h>
 #include <time.h>
 #include <unistd.h>