diff --git a/env/env.go b/env/env.go
index 98245b0..8343d3d 100644
--- a/env/env.go
+++ b/env/env.go
@@ -104,7 +104,7 @@ func setFieldValue(v reflect.Value, f reflect.StructField, prefix string) error
 		return nil
 	}
 
-	envValue, ok := getEnvValue(prefix+envName, f)
+	envValue, ok := os.LookupEnv(prefix + envName)
 	if !ok {
 		return nil
 	}