diff --git a/machine.cfg b/machine.cfg
index 0bb17da..d0013c5 100644
--- a/machine.cfg
+++ b/machine.cfg
@@ -212,7 +212,7 @@ cycle_time: 0.010
 #####################################################################
 
 [temperature_sensor chamber]
-sensor type: NTC 100K beta 3950
+sensor_type: NTC 100K beta 3950
 sensor_pin: Z_STOP
 pullup_resistor: 10000
 inline_resistor: 100