diff --git a/astroid/nodes/node_ng.py b/astroid/nodes/node_ng.py
index 6d149e3840..afbeef7099 100644
--- a/astroid/nodes/node_ng.py
+++ b/astroid/nodes/node_ng.py
@@ -21,7 +21,7 @@
     overload,
 )
 
-from astroid import util
+from astroid import nodes, util
 from astroid.context import InferenceContext
 from astroid.exceptions import (
     AstroidError,
@@ -332,11 +332,13 @@ def root(self) -> nodes.Module:
         :returns: The root node.
         """
         if not (parent := self.parent):
-            return self  # type: ignore[return-value] # Only 'Module' does not have a parent node.
+            assert isinstance(self, nodes.Module)
+            return self
 
         while parent.parent:
             parent = parent.parent
-        return parent  # type: ignore[return-value] # Only 'Module' does not have a parent node.
+        assert isinstance(parent, nodes.Module)
+        return parent
 
     def child_sequence(self, child):
         """Search for the sequence that contains this child.