diff --git a/ChangeLog b/ChangeLog
index f4fb3f306..2300a65ab 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
 	* frontend/scanimage.c: exit with error if stdout isatty()
 	* doc/descriptions/unsupported.desc, doc/descriptions/lexmark.desc:
 	- add Dell A940 and correct manpage name
+	* backend/gt68xx_high.c: maximum exposure 245 not 248, see bug #312113
 
 2010-02-10 m. allan noah <kitno455 at gmail dot com>
 	* backend/cardscan.[ch], backend/cardscan.conf.in,
diff --git a/backend/gt68xx_high.c b/backend/gt68xx_high.c
index 2d8994a78..25885b058 100644
--- a/backend/gt68xx_high.c
+++ b/backend/gt68xx_high.c
@@ -1919,15 +1919,15 @@ gt68xx_afe_cis_auto (GT68xx_Scanner * scanner)
 				      r_gbuffer, g_gbuffer, b_gbuffer));
       if (!red_done)
 	red_done =
-	  gt68xx_afe_cis_adjust_exposure ("red", &values, r_gbuffer, 248,
+	  gt68xx_afe_cis_adjust_exposure ("red", &values, r_gbuffer, 245,
 					  &exposure->r_time);
       if (!green_done)
 	green_done =
-	  gt68xx_afe_cis_adjust_exposure ("green", &values, g_gbuffer, 248,
+	  gt68xx_afe_cis_adjust_exposure ("green", &values, g_gbuffer, 245,
 					  &exposure->g_time);
       if (!blue_done)
 	blue_done =
-	  gt68xx_afe_cis_adjust_exposure ("blue", &values, b_gbuffer, 248,
+	  gt68xx_afe_cis_adjust_exposure ("blue", &values, b_gbuffer, 245,
 					  &exposure->b_time);
       exposure_count++;
       total_count++;