diff --git a/lib/treppe/treppe.h b/lib/treppe/treppe.h
index ca3beec..c96cd77 100644
--- a/lib/treppe/treppe.h
+++ b/lib/treppe/treppe.h
@@ -5,7 +5,7 @@
 #include "PCA9685.h"
 #include <EEPROM.h>
 
-// #define LDR_REGELUNG // comment in to activate LDR control
+#define LDR_REGELUNG // comment in to activate LDR control
 // #define LDRDEBUG  // comment in to show LDR measurement
 #define LDR_HYS 100 // Hysteresis for switching off FSM [lux]
 #define LDR_AVERAGE_SAMPLES 50