diff --git a/drivers/media/dvb/siano/smsendian.h b/drivers/media/dvb/siano/smsendian.h
index 7fbedc6a6527..1624d6fd367b 100644
--- a/drivers/media/dvb/siano/smsendian.h
+++ b/drivers/media/dvb/siano/smsendian.h
@@ -24,9 +24,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <asm/byteorder.h>
 
-void smsendian_handle_tx_message(void *buffer);
-void smsendian_handle_rx_message(void *buffer);
-void smsendian_handle_message_header(void *msg);
+extern void smsendian_handle_tx_message(void *buffer);
+extern void smsendian_handle_rx_message(void *buffer);
+extern void smsendian_handle_message_header(void *msg);
 
 #endif /* __SMS_ENDIAN_H__ */