diff --git a/libc/string/lib_strcasestr.c b/libc/string/lib_strcasestr.c
index ab8df1eede2..e7ab021ffad 100644
--- a/libc/string/lib_strcasestr.c
+++ b/libc/string/lib_strcasestr.c
@@ -1,7 +1,7 @@
 /****************************************************************************
- * libc/string/lib_strstr.c
+ * libc/string/lib_strcasestr.c
  *
- *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2012, 2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use str source and binary forms, with or without
@@ -40,6 +40,7 @@
 #include <nuttx/config.h>
 
 #include <string.h>
+#include <strings.h>
 #include <ctype.h>
 
 /****************************************************************************