diff --git a/ampel-firmware/co2_sensor.cpp b/ampel-firmware/co2_sensor.cpp
index b7a98d213ddf4e3625db19a5f284907c32072216..9a733201a9554d2b2d62398b916efb1009d7016a 100644
--- a/ampel-firmware/co2_sensor.cpp
+++ b/ampel-firmware/co2_sensor.cpp
@@ -56,6 +56,8 @@ namespace sensor {
   void calibrateSensorToSpecificPPM(int32_t calibrationLevel);
   void calibrateSensorRightNow(int32_t calibrationLevel);
   void setAutoCalibration(int32_t autoCalibration);
+  void setTimer(int32_t timestep);
+  void resetSCD();
 
   void initialize() {
 #if defined(ESP8266)
diff --git a/ampel-firmware/co2_sensor.h b/ampel-firmware/co2_sensor.h
index e152f2777e87947d0b15a7712985fe9deddf1e7a..41ec01686a91babf48425b26f9200d109355075a 100644
--- a/ampel-firmware/co2_sensor.h
+++ b/ampel-firmware/co2_sensor.h
@@ -12,8 +12,6 @@ namespace sensor {
   void initialize();
   bool processData();
   void startCalibrationProcess();
-  void setTimer(int32_t timestep);
-  void resetSCD();
   float getTemperatureOffset();
 }
 #endif