diff --git a/main.go b/main.go
index 46d27ee..b8ebe04 100644
--- a/main.go
+++ b/main.go
@@ -180,12 +180,12 @@ type TICWriter interface {
 }
 
 func main() {
-	parseEnvironmentVariables()
-
 	var legacyMode = flag.Bool("legacy-mode", false, "Assume teleinformation in legacy mode")
 	var pushFrequency = flag.Bool("push-frequency", false, "Also fetch data about the grid frequency")
 	flag.Parse()
 
+	parseEnvironmentVariables()
+
 	if len(flag.Args()) < 1 {
 		log.Println("missing required argument: serial device (eg. /dev/ttyUSB0)")
 		return