diff --git a/js/xpconnect/src/XPCComponents.cpp b/js/xpconnect/src/XPCComponents.cpp
index ba060e4cdbd..602dde5b89b 100644
--- a/js/xpconnect/src/XPCComponents.cpp
+++ b/js/xpconnect/src/XPCComponents.cpp
@@ -4837,8 +4837,7 @@ ContentComponentsGetterOp(JSContext *cx, JSHandleObject obj, JSHandleId id,
 // static
 JSBool
 nsXPCComponents::AttachComponentsObject(XPCCallContext& ccx,
-                                        XPCWrappedNativeScope* aScope,
-                                        JSObject* aTarget)
+                                        XPCWrappedNativeScope* aScope)
 {
     JSObject *components = aScope->GetComponentsJSObject(ccx);
     if (!components)
@@ -4846,13 +4845,11 @@ nsXPCComponents::AttachComponentsObject(XPCCallContext& ccx,
 
     JSObject *global = aScope->GetGlobalJSObject();
     MOZ_ASSERT(js::IsObjectInContextCompartment(global, ccx));
-    if (!aTarget)
-        aTarget = global;
 
     jsid id = ccx.GetRuntime()->GetStringID(XPCJSRuntime::IDX_COMPONENTS);
     JSPropertyOp getter = AccessCheck::isChrome(global) ? nullptr
                                                         : &ContentComponentsGetterOp;
-    return JS_DefinePropertyById(ccx, aTarget, id, js::ObjectValue(*components),
+    return JS_DefinePropertyById(ccx, global, id, js::ObjectValue(*components),
                                  getter, nullptr, JSPROP_PERMANENT | JSPROP_READONLY);
 }
 
diff --git a/js/xpconnect/src/xpcprivate.h b/js/xpconnect/src/xpcprivate.h
index b9d6efd15ca..73191ed0745 100644
--- a/js/xpconnect/src/xpcprivate.h
+++ b/js/xpconnect/src/xpcprivate.h
@@ -3718,13 +3718,9 @@ public:
     NS_DECL_NSISECURITYCHECKEDCOMPONENT
 
 public:
-    // The target is the object upon which |Components| will be defined. If
-    // aTarget is left null, a default object will be computed. This is usually
-    // the right thing to do.
     static JSBool
     AttachComponentsObject(XPCCallContext& ccx,
-                           XPCWrappedNativeScope* aScope,
-                           JSObject* aTarget = NULL);
+                           XPCWrappedNativeScope* aScope);
 
     void SystemIsBeingShutDown() {ClearMembers();}