diff --git a/vm/src/builtins/namespace.rs b/vm/src/builtins/namespace.rs
index ec0ffcea9..3d4838803 100644
--- a/vm/src/builtins/namespace.rs
+++ b/vm/src/builtins/namespace.rs
@@ -4,8 +4,8 @@ use crate::{
     class::PyClassImpl,
     function::{FuncArgs, PyComparisonValue},
     recursion::ReprGuard,
-    types::{Comparable, Constructor, PyComparisonOp},
-    AsObject, Context, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
+    types::{Comparable, Constructor, Initializer, PyComparisonOp},
+    AsObject, Context, PyObject, PyPayload, PyRef, PyResult, VirtualMachine,
 };
 
 /// A simple attribute-based namespace.
@@ -39,21 +39,8 @@ impl PyNamespace {
     }
 }
 
-#[pyimpl(flags(BASETYPE, HAS_DICT), with(Constructor, Comparable))]
+#[pyimpl(flags(BASETYPE, HAS_DICT), with(Constructor, Initializer, Comparable))]
 impl PyNamespace {
-    #[pyslot]
-    #[pymethod(magic)]
-    fn init(zelf: PyObjectRef, args: FuncArgs, vm: &VirtualMachine) -> PyResult<()> {
-        let zelf: PyRef<Self> = zelf.try_into_value(vm)?;
-        if !args.args.is_empty() {
-            return Err(vm.new_type_error("no positional arguments expected".to_owned()));
-        }
-        for (name, value) in args.kwargs.into_iter() {
-            zelf.as_object().set_attr(name, value, vm)?;
-        }
-        Ok(())
-    }
-
     #[pymethod(magic)]
     fn repr(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult<String> {
         let o = zelf.as_object();
@@ -80,6 +67,20 @@ impl PyNamespace {
     }
 }
 
+impl Initializer for PyNamespace {
+    type Args = FuncArgs;
+
+    fn init(zelf: PyRef<Self>, args: Self::Args, vm: &VirtualMachine) -> PyResult<()> {
+        if !args.args.is_empty() {
+            return Err(vm.new_type_error("no positional arguments expected".to_owned()));
+        }
+        for (name, value) in args.kwargs.into_iter() {
+            zelf.as_object().set_attr(name, value, vm)?;
+        }
+        Ok(())
+    }
+}
+
 impl Comparable for PyNamespace {
     fn cmp(
         zelf: &crate::Py<Self>,