diff --git a/ampel-firmware/co2_sensor.cpp b/ampel-firmware/co2_sensor.cpp
index a4caca6e3c16827f67950a1992d6c22bff8be8a5..204d61538dedd8fb87b505ee6ed0f4fdad0e11ef 100644
--- a/ampel-firmware/co2_sensor.cpp
+++ b/ampel-firmware/co2_sensor.cpp
@@ -133,7 +133,7 @@ namespace sensor {
     last_co2 = co2;
     // We assume the sensor has acclimated to the environment if measurements
     // change less than a specified percentage of the current value.
-    return (co2 > 0 && delta < ((uint32_t)co2 * config::max_deviation_during_bootup / 100));
+    return (co2 > 0 && delta < ((uint32_t) co2 * config::max_deviation_during_bootup / 100));
   }
 
   bool countStableMeasurements() {
@@ -199,7 +199,9 @@ namespace sensor {
 
   void switchStateForCurrentPPM() {
     if (current_state == BOOTUP) {
-      if (!hasSensorSettled()) return;
+      if (!hasSensorSettled()) {
+        return;
+      }
       switchState(READY);
       Serial.println(F("Sensor acclimatization finished."));
       Serial.print(F("Setting SCD30 timestep to "));