diff --git a/core/dev/simple-cc2420.c b/core/dev/simple-cc2420.c
index b0bb63917..8839bcbb9 100644
--- a/core/dev/simple-cc2420.c
+++ b/core/dev/simple-cc2420.c
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: simple-cc2420.c,v 1.22 2008/01/15 08:52:16 nvt-se Exp $
+ * @(#)$Id: simple-cc2420.c,v 1.23 2008/01/15 08:53:52 nvt-se Exp $
  */
 /*
  * This code is almost device independent and should be easy to port.
@@ -600,7 +600,7 @@ simple_cc2420_set_txpower(u8_t power)
 }
 /*---------------------------------------------------------------------------*/
 int
-simple_cc2420_get_txpower()
+simple_cc2420_get_txpower(void)
 {
   return (int)(getreg(CC2420_TXCTRL) & 0x001f);
 }
diff --git a/core/dev/simple-cc2420.h b/core/dev/simple-cc2420.h
index 8db414aab..da00fb3e6 100644
--- a/core/dev/simple-cc2420.h
+++ b/core/dev/simple-cc2420.h
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: simple-cc2420.h,v 1.7 2008/01/07 14:41:34 adamdunkels Exp $
+ * $Id: simple-cc2420.h,v 1.8 2008/01/15 08:53:52 nvt-se Exp $
  */
 
 /**
@@ -66,6 +66,7 @@ extern const struct radio_driver simple_cc2420_driver;
  * \param power Between 1 and 31.
  */
 void simple_cc2420_set_txpower(u8_t power);
+int simple_cc2420_get_txpower(void);
 #define SIMPLE_CC2420_TXPOWER_MAX  31
 #define SIMPLE_CC2420_TXPOWER_MIN   0