diff --git a/cfg.go b/cfg.go
index 1ca257e..b48bfe3 100644
--- a/cfg.go
+++ b/cfg.go
@@ -6,15 +6,15 @@ import (
 )
 
 func getUploadKey() (string, error) {
-	PXL_KEY := os.Getenv("PXL_KEY")
-	if PXL_KEY != "" {
-		return PXL_KEY, nil
+	readKey := os.Getenv("PXL_KEY")
+	if readKey != "" {
+		return readKey, nil
 	}
 
-	MIRAGE_KEY := os.Getenv("MIRAGE_KEY")
-	if MIRAGE_KEY != "" {
-		return MIRAGE_KEY, nil
+	readKey = os.Getenv("MIRAGE_KEY")
+	if readKey != "" {
+		return readKey, nil
 	}
 
-	return "", errors.New("Upload key not set as environment variable!")
+	return "", errors.New("upload key not set as environment variable")
 }