diff --git a/src/components/script/dom/bindings/codegen/CodegenRust.py b/src/components/script/dom/bindings/codegen/CodegenRust.py
index 6000e2abcba..57dc3cd82a5 100644
--- a/src/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/src/components/script/dom/bindings/codegen/CodegenRust.py
@@ -2792,7 +2792,7 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
             return "ptr::to_unsafe_ptr(&%s[0])" % val
 
         call = """return CreateInterfaceObjects2(aCx, aGlobal, aReceiver, parentProto,
-                               %s, ptr::null(), %s, %d,
+                               %s, %s, %d,
                                %s,
                                %s,
                                %s,
diff --git a/src/components/script/dom/bindings/utils.rs b/src/components/script/dom/bindings/utils.rs
index 7c0c7a9a1e7..0ec4e4f9755 100644
--- a/src/components/script/dom/bindings/utils.rs
+++ b/src/components/script/dom/bindings/utils.rs
@@ -362,7 +362,7 @@ pub fn GetProtoOrIfaceArray(global: *JSObject) -> **JSObject {
 
 pub fn CreateInterfaceObjects2(cx: *JSContext, global: *JSObject, receiver: *JSObject,
                                protoProto: *JSObject, protoClass: *JSClass,
-                               constructorClass: *JSClass, constructor: Option<JSNative>,
+                               constructor: Option<JSNative>,
                                ctorNargs: u32,
                                domClass: *DOMClass,
                                methods: *JSFunctionSpec,
@@ -386,9 +386,9 @@ pub fn CreateInterfaceObjects2(cx: *JSContext, global: *JSObject, receiver: *JSO
     }
 
     let mut interface = ptr::null();
-    if constructorClass.is_not_null() || constructor.is_some() {
+    if constructor.is_some() {
         interface = name.to_c_str().with_ref(|s| {
-            CreateInterfaceObject(cx, global, receiver, constructorClass,
+            CreateInterfaceObject(cx, global, receiver, ptr::null(),
                                   constructor, ctorNargs, proto,
                                   staticMethods, constants, s)
         });