diff --git a/nnn.c b/nnn.c
index f3619d30..abb90b5e 100644
--- a/nnn.c
+++ b/nnn.c
@@ -71,6 +71,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <time.h>
 #include <unistd.h>
 #ifndef __USE_XOPEN_EXTENDED