diff --git a/comedi_calibrate/cb64.c b/comedi_calibrate/cb64.c
index d24e67c..d1a4e72 100644
--- a/comedi_calibrate/cb64.c
+++ b/comedi_calibrate/cb64.c
@@ -570,7 +570,6 @@ static int init_observables_60xx( calibration_setup_t *setup )
 	}
 	for( i = 0; i < num_ranges; i++ )
 	{
-fprintf(stderr, "setting up ai observables for range %i out of %i\n", i, num_ranges);
 		o = setup->observables + ai_ground_observable_index_60xx( setup, 0, i );
 		o->reference_source = CAL_SRC_GROUND;
 		assert( o->name == NULL );