diff --git a/platformio.ini b/platformio.ini
index c94b126..7e57bd3 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -493,7 +493,7 @@ extends=Core, option_release, arduino_5_4_0
 build_src_filter = +<*> -<.git/> -<.svn/> +<../examples/UnitUnified/UnitKmeterISO/PlotToSerial>
 
 [env:UnitKmeterISO_PlotToSerial_Core_Arduino_4_4_0]
-extends=Core, option_release, arduino_5_4_0
+extends=Core, option_release, arduino_4_4_0
 build_src_filter = +<*> -<.git/> -<.svn/> +<../examples/UnitUnified/UnitKmeterISO/PlotToSerial>
 
 [env:UnitKmeterISO_PlotToSerial_Core2_Arduino_latest]