diff --git a/nshlib/nsh_altconsole.c b/nshlib/nsh_altconsole.c
index 831725f4f..4f6cb5bd6 100644
--- a/nshlib/nsh_altconsole.c
+++ b/nshlib/nsh_altconsole.c
@@ -29,6 +29,7 @@
 #include <fcntl.h>
 #include <assert.h>
 #include <debug.h>
+#include <string.h>
 
 #include "nsh.h"
 #include "nsh_console.h"