diff --git a/midas/checker/midas.py b/midas/checker/midas.py
index 810049e..3efa5d4 100644
--- a/midas/checker/midas.py
+++ b/midas/checker/midas.py
@@ -364,6 +364,8 @@ class MidasTyper(m.Stmt.Visitor[None], m.Expr.Visitor[Type], m.Type.Visitor[Type
                 return self.types.get_type("float")
             case str():
                 return self.types.get_type("str")
+            case None:
+                return self.types.get_type("None")
             case _:
                 self.reporter.warning(expr.location, f"Unknown literal {expr}")
                 return UnknownType()