diff --git a/drivers/staging/comedi/drivers/amplc_dio200.h b/drivers/staging/comedi/drivers/amplc_dio200.h
index 2dbeea6c9d77..53fb86d59fc3 100644
--- a/drivers/staging/comedi/drivers/amplc_dio200.h
+++ b/drivers/staging/comedi/drivers/amplc_dio200.h
@@ -23,6 +23,10 @@
 #ifndef AMPLC_DIO200_H_INCLUDED
 #define AMPLC_DIO200_H_INCLUDED
 
+#include <linux/types.h>
+
+struct comedi_device;
+
 /*
  * Subdevice types.
  */