diff --git a/backend/gt68xx_high.c b/backend/gt68xx_high.c
index f3b459573..28d0def5c 100644
--- a/backend/gt68xx_high.c
+++ b/backend/gt68xx_high.c
@@ -2630,6 +2630,7 @@ static SANE_Status gt68xx_read_calibration (GT68xx_Scanner * scanner)
   DBG(5,"gt68xx_read_calibration: read %d calibrations\n",i);
   fclose(fcal);
 
+  scanner->val[OPT_QUALITY_CAL].w = SANE_TRUE;
   scanner->calibrated = SANE_TRUE;
   return SANE_STATUS_GOOD;
 }