diff --git a/src/device/input/raw/raw.go b/src/device/input/raw/raw.go
index cbc89ab..2c7eb21 100644
--- a/src/device/input/raw/raw.go
+++ b/src/device/input/raw/raw.go
@@ -20,7 +20,7 @@ func New(ctx context.Context) Raw {
 		return NewUDP(ctx, port)
 	}
 	generator := randomCharFromRange('a', 'g')
-	if p, ok := os.LookupEnv("RAW_RANDOM_WEIGHT_FILE"); ok && len(p) > 0 {
+	if p := os.Getenv("RAW_RANDOM_WEIGHT_FILE"); p != "" {
 		generator = randomCharFromWeightFile(p)
 	}
 	return NewRandom(generator)
diff --git a/src/main.go b/src/main.go
index 657d20c..a660707 100644
--- a/src/main.go
+++ b/src/main.go
@@ -17,7 +17,7 @@ func Main(ctx context.Context) error {
 	defer reader.Close()
 
 	interval := time.Millisecond * 50
-	if intervalS, ok := os.LookupEnv("MAIN_INTERVAL_DURATION"); !ok {
+	if intervalS := os.Getenv("MAIN_INTERVAL_DURATION"); intervalS != "" {
 	} else if v, err := time.ParseDuration(intervalS); err != nil {
 		panic(err)
 	} else {