diff --git a/backend/genesys_gl843.c b/backend/genesys_gl843.c
index b22f01b82..ad77b2113 100644
--- a/backend/genesys_gl843.c
+++ b/backend/genesys_gl843.c
@@ -1177,7 +1177,7 @@ gl843_init_optical_regs_scan (Genesys_Device * dev,
   /* sensor parameters */
   gl843_setup_sensor (dev, reg, dpihw, flags);
 
-  /* resolution is divided according to CKSEL which is known once sensor is set up*/ 
+  /* resolution is divided according to CKSEL which is known once sensor is set up */ 
   r = sanei_genesys_get_address (reg, REG18);
   cksel= (r->value & REG18_CKSEL)+1;
   DBG (DBG_io2, "%s: cksel=%d\n", __FUNCTION__, cksel);
@@ -2811,6 +2811,7 @@ gl843_init_regs_for_coarse_calibration (Genesys_Device * dev)
 				 dev->settings.yres,
 				 0,
 				 0,
+                                 /* XXX STEF XXX dpi instead of pixels !*/
 				 dev->sensor.optical_res / cksel,
 				 20,
 				 16,
diff --git a/backend/genesys_gl843.h b/backend/genesys_gl843.h
index e5a0612a1..bab563880 100644
--- a/backend/genesys_gl843.h
+++ b/backend/genesys_gl843.h
@@ -613,7 +613,7 @@ typedef struct {
  */
 static Sensor_Profile xpa_sensors[]={
 	{CCD_G4050  ,  600, 15624, 0x001c7f, 0x03ffff, 0x03ffff, 5168, 0, 0x2a, 0, 0, 0, 0x00, 0x00, 0x02, 0x00, 0x00,
-        {0x2c, 0x09, 0x22, 0xb8, 0x10, 0xf0, 0x33, 0x4c, 0x00, 0x2a, 0x30, 0x00, 0x00, 0x08} ,
+        {0x2c, 0x09, 0x22, 0xb8, 0x10, 0xf0, 0x33, 0x4c, 0x01, 0x2a, 0x30, 0x00, 0x00, 0x08} ,
         {0x0e, 0x11, 0x02, 0x05, 0x08, 0x0b, 0x6b, 0x00, 0xc0, 0x00, 0x00, 0x00, 0x6f},
         },
 };