diff --git a/nixos/klipper/ender3v3se.cfg b/nixos/klipper/ender3v3se.cfg
index 64f10b32..2ecfde81 100644
--- a/nixos/klipper/ender3v3se.cfg
+++ b/nixos/klipper/ender3v3se.cfg
@@ -40,6 +40,9 @@ step_pin:PB4
 [fan]
 pin:PA0
 
+[filament_switch_sensor filament_sensor]
+switch_pin:!PC15
+
 [filter]
 
 [heater_bed]