diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index f634d677c..10c83fec8 100644
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -6939,6 +6939,7 @@ static bool lcd_selftest_manual_fan_check(int _fan, bool check_opposite,
 
 
 		manage_heater();
+		manage_inactivity(true);
 		_delay(100);
 
 	} while (!lcd_clicked());