diff --git a/backend/pixma.c b/backend/pixma.c
index d34efbea5..e1e7ff255 100644
--- a/backend/pixma.c
+++ b/backend/pixma.c
@@ -1673,7 +1673,7 @@ type int resolution
 
 type string mode[30]
   constraint @string_list = ss->mode_list
-  default @s = SANE_I18N(ss->mode_list[0])
+  default @s = SANE_VALUE_SCAN_MODE_COLOR
   title @SANE_TITLE_SCAN_MODE
   desc  @SANE_DESC_SCAN_MODE
   cap soft_select soft_detect automatic
diff --git a/backend/pixma_mp750.c b/backend/pixma_mp750.c
index 92e180db8..6467d8241 100644
--- a/backend/pixma_mp750.c
+++ b/backend/pixma_mp750.c
@@ -881,7 +881,7 @@ mp750_finish_scan (pixma_t * s)
     case state_scanning:
     case state_warmup:
       error = abort_session (s);
-      if (abort_session (s) == PIXMA_ECANCELED)
+      if (error == PIXMA_ECANCELED)
 	read_error_info (s, NULL, 0);
       /* fall through */
     case state_finished:
diff --git a/backend/pixma_mp810.c b/backend/pixma_mp810.c
index 0204b7b4a..89d8660dd 100644
--- a/backend/pixma_mp810.c
+++ b/backend/pixma_mp810.c
@@ -497,6 +497,7 @@ static int has_ccd_sensor (pixma_t * s)
   return ((s->cfg->cap & PIXMA_CAP_CCD) != 0);
 }
 
+#if 0
 static int is_color (pixma_t * s)
 {
   return (s->param->mode == PIXMA_SCAN_MODE_COLOR);
@@ -516,6 +517,7 @@ static int is_color_all (pixma_t * s)
 {
   return (is_color (s) || is_color_48 (s) || is_color_negative (s));
 }
+#endif
 
 static int is_gray (pixma_t * s)
 {
@@ -1401,7 +1403,7 @@ static unsigned post_process_image_data (pixma_t * s, pixma_imagebuf_t * ib)
   mp810_t *mp = (mp810_t *) s->subdriver;
   unsigned c, lines, i, line_size, n, m, cw, cx, reducelines;
   uint8_t *sptr, *dptr, *gptr, *cptr;
-  unsigned color_shift, stripe_shift, stripe_shift2, jumplines /*, height*/;
+  unsigned /*color_shift, stripe_shift, stripe_shift2,*/ jumplines /*, height*/;
   int test;
 
   /* For testers: */
@@ -1456,9 +1458,9 @@ static unsigned post_process_image_data (pixma_t * s, pixma_imagebuf_t * ib)
   /* PDBG (pixma_dbg (4, "*post_process_image_data***** mp->color_shift = %u, mp->stripe_shift = %u, , mp->stripe_shift2 = %u ***** \n",
                mp->color_shift, mp->stripe_shift, mp->stripe_shift2)); */
 
-  color_shift = mp->color_shift;
-  stripe_shift = mp->stripe_shift;
-  stripe_shift2 = mp->stripe_shift2;
+  /*color_shift = mp->color_shift;*/
+  /*stripe_shift = mp->stripe_shift;*/
+  /*stripe_shift2 = mp->stripe_shift2;*/
   jumplines = mp->jumplines;
 
   /* height not needed here! */
diff --git a/backend/pixma_sane_options.c b/backend/pixma_sane_options.c
index 50cb78378..946bd9d2f 100644
--- a/backend/pixma_sane_options.c
+++ b/backend/pixma_sane_options.c
@@ -72,7 +72,7 @@ int build_option_descriptors(struct pixma_sane_t *ss)
   sod->constraint_type = SANE_CONSTRAINT_STRING_LIST;
   sod->constraint.string_list = ss->mode_list;
   OPT_IN_CTX[opt_mode].info = SANE_INFO_RELOAD_PARAMS;
-  opt->def.s = SANE_I18N(ss->mode_list[0]);
+  opt->def.s = SANE_VALUE_SCAN_MODE_COLOR;
   opt->val.w = find_string_in_list(opt->def.s, sod->constraint.string_list);
 
   opt = &(OPT_IN_CTX[opt_source]);