diff --git a/examples/adc/adc_main.c b/examples/adc/adc_main.c
index d8cb48df6..38d5d3fb1 100644
--- a/examples/adc/adc_main.c
+++ b/examples/adc/adc_main.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * examples/adc/adc_main.c
  *
- *   Copyright (C) 2011-2012, 2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2012, 2015, 2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -51,6 +51,7 @@
 #include <debug.h>
 
 #include <nuttx/analog/adc.h>
+#include <nuttx/analog/ioctl.h>
 
 #include "adc.h"