diff --git a/platformio.ini b/platformio.ini
index b5dc82d..48ac2b9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -20,7 +20,7 @@ upload_port = /dev/ttyUSB0
 build_flags =
     -DNoDEBUG
     -DHELLIGKEIT
-    -DNoDebugCO2
+    -DNODebugCO2
 
 lib_deps =
     knolleary/PubSubClient @ 2.8