diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 0c605b1b9960e073e4b83256d63ee077137b12ce..7ee103e4714fd7a944a26230e60428a15221f8df 100755
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -7829,6 +7829,9 @@ class CloneNode(CoercionNode):
     def result(self):
         return self.arg.result()
 
+    def may_be_none(self):
+        return self.arg.may_be_none()
+
     def type_dependencies(self, env):
         return self.arg.type_dependencies(env)