diff --git a/certbot-apache/certbot_apache/interfaces.py b/certbot-apache/certbot_apache/interfaces.py
index 08b226349..d2731014d 100644
--- a/certbot-apache/certbot_apache/interfaces.py
+++ b/certbot-apache/certbot_apache/interfaces.py
@@ -243,11 +243,11 @@ class BlockNode(ParserNode):
     name: str
 
     # Tuple of parameters of this ParserNode object, excluding whitespaces.
-    parameters: Tuple[str]
+    parameters: Tuple[str, ...]
 
     # Tuple of ParserNode objects that are the children for this node. The order
     # of the children is the same s that of the parsed configuration block.
-    children: Tuple[ParserNode]
+    children: Tuple[ParserNode, ...]
     """
 
     @abc.abstractmethod