diff --git a/ChangeLog b/ChangeLog
index 24237e673..259a60f85 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2009-01-18  Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
+	* backend/genesys_low.h: Fix prototype of update_hardware_sensors
+
 2009-01-16 Chris Bagwell <cbagwell-guest at users.alioth.debian.org>
 	* .cvsignore, Makefile.in, aclocal.m4, config.sub, configure,
 	configure.in, backend/cvsignore, include/Makefile.in,
diff --git a/backend/genesys_low.h b/backend/genesys_low.h
index 1c72e4f5d..4c8a87925 100644
--- a/backend/genesys_low.h
+++ b/backend/genesys_low.h
@@ -265,6 +265,7 @@ Genesys_Color_Order;
 
 /* Forward typedefs */
 typedef struct Genesys_Device Genesys_Device;
+struct Genesys_Scanner;
 
 /**
  * Scanner command set description.
@@ -349,7 +350,7 @@ typedef struct Genesys_Command_Set
      in Genesys_Scanner.last_val[], in such a way that a button up/down 
      relative to Genesys_Scanner.last_val[] is not lost.
    */
-  SANE_Status (*update_hardware_sensors) (Genesys_Device * dev,
+  SANE_Status (*update_hardware_sensors) (struct Genesys_Scanner * s,
 					  SANE_Int option);
 } Genesys_Command_Set;