diff --git a/dockerfile_parse/util.py b/dockerfile_parse/util.py
index 2ef70ca..f4bac87 100644
--- a/dockerfile_parse/util.py
+++ b/dockerfile_parse/util.py
@@ -355,7 +355,7 @@ def __init__(self, registry=None, namespace=None, repo=None, tag=None):
         self.tag = tag
 
     @classmethod
-    def parse(cls, image_name: str):
+    def parse(cls, image_name):
         result = cls()
 
         if not image_name or image_name.isspace():