diff --git a/vm/src/obj/objdict.rs b/vm/src/obj/objdict.rs
index 449c60726..541645d5f 100644
--- a/vm/src/obj/objdict.rs
+++ b/vm/src/obj/objdict.rs
@@ -206,14 +206,14 @@ impl PyDictRef {
     fn hash(self, vm: &VirtualMachine) -> PyResult {
         Err(vm.new_type_error("unhashable type".to_string()))
     }
-}
 
-impl DictProtocol for PyDictRef {
-    fn contains_key<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> bool {
+    pub fn contains_key<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> bool {
         let key = key.into_pyobject(vm).unwrap();
         self.entries.borrow().contains(vm, &key).unwrap()
     }
+}
 
+impl DictProtocol for PyDictRef {
     fn get_item<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> Option<PyObjectRef> {
         let key = key.into_pyobject(vm).unwrap();
         self.entries.borrow().get(vm, &key).ok()
diff --git a/vm/src/pyobject.rs b/vm/src/pyobject.rs
index 4df7e57fe..bf5cf3c86 100644
--- a/vm/src/pyobject.rs
+++ b/vm/src/pyobject.rs
@@ -913,7 +913,6 @@ impl<T> TypeProtocol for PyRef<T> {
 }
 
 pub trait DictProtocol {
-    fn contains_key<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> bool;
     fn get_item<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> Option<PyObjectRef>;
     fn set_item<T: IntoPyObject>(&self, key: T, value: PyObjectRef, vm: &VirtualMachine);
     fn del_item<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine);