diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index e857b1c2f7..a9c49c4415 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -673,7 +673,7 @@ Sensors::parameters_update()
 		if (!isfinite(_parameters.scaling_factor[i]) ||
 		    _parameters.scaling_factor[i] * _parameters.rev[i] < 0.000001f ||
 		    _parameters.scaling_factor[i] * _parameters.rev[i] > 0.2f) {
-
+			warnx("RC chan %u not sane, scaling: %8.6f, rev: %d", i, _parameters.scaling_factor[i], (int)(_parameters.rev[i]));
 			/* scaling factors do not make sense, lock them down */
 			_parameters.scaling_factor[i] = 0;
 			rc_valid = false;