diff --git a/tools/pre_compile.py b/tools/pre_compile.py
index d059b51..678966e 100644
--- a/tools/pre_compile.py
+++ b/tools/pre_compile.py
@@ -2,7 +2,7 @@
 
 env.Append(CPPDEFINES=[
     ("SWVERSION", env.StringifyMacro(env.GetProjectOption("custom_prog_version"))),
-    ("HWBOARD", env.StringifyMacro(env["BOARD"])),
+    ("HWBOARD", env.StringifyMacro(env["PIOENV"])),
 ])
 
-env.Replace(PROGNAME="Daly2MQTT_%s_%s" % (str(env["BOARD"]), env.GetProjectOption("custom_prog_version")))
+env.Replace(PROGNAME="Daly2MQTT_%s_%s" % (str(env["PIOENV"]), env.GetProjectOption("custom_prog_version")))