diff --git a/backend/mustek_usb.c b/backend/mustek_usb.c
index f0f176769..aedc04074 100644
--- a/backend/mustek_usb.c
+++ b/backend/mustek_usb.c
@@ -1291,7 +1291,7 @@ sane_control_option (SANE_Handle handle, SANE_Int option,
 	    free (s->val[option].s);
 	  s->val[option].s = strdup (val);
 	  
-	  RIE(status = calc_parameters(s));
+	  RIE(calc_parameters(s));
 
 	  s->opt[OPT_BRIGHTNESS].cap |= SANE_CAP_INACTIVE;
 	  s->opt[OPT_CUSTOM_GAMMA].cap |= SANE_CAP_INACTIVE;
diff --git a/doc/mustek_usb/mustek_usb.CHANGES b/doc/mustek_usb/mustek_usb.CHANGES
index bcb9bc49a..ae8ce0e0c 100644
--- a/doc/mustek_usb/mustek_usb.CHANGES
+++ b/doc/mustek_usb/mustek_usb.CHANGES
@@ -1,5 +1,8 @@
 CHANGES for the SANE Mustek USB backend
 
+2002-01-23:
+  * Fixed undefined operation warnings.
+
 2002-01-11
   * Release of version 1.0-10.