diff --git a/components/script/dom/serviceworkerregistration.rs b/components/script/dom/serviceworkerregistration.rs
index 87226207266..e274e5a6e51 100644
--- a/components/script/dom/serviceworkerregistration.rs
+++ b/components/script/dom/serviceworkerregistration.rs
@@ -60,7 +60,7 @@ impl ServiceWorkerRegistration {
 
         let worker_id = global_scope.get_next_worker_id();
         let devtools_chan = global_scope.devtools_chan().cloned();
-        let init = prepare_workerscope_init(global, None);
+        let init = prepare_workerscope_init(global_scope, None);
         ScopeThings {
             script_url: script_url,
             init: init,
diff --git a/components/script/dom/worker.rs b/components/script/dom/worker.rs
index 9e590b0f7da..1ef6242720d 100644
--- a/components/script/dom/worker.rs
+++ b/components/script/dom/worker.rs
@@ -105,7 +105,7 @@ impl Worker {
                                                                 page_info));
         }
 
-        let init = prepare_workerscope_init(global, Some(devtools_sender));
+        let init = prepare_workerscope_init(global_scope, Some(devtools_sender));
 
         DedicatedWorkerGlobalScope::run_worker_scope(
             init, worker_url, devtools_receiver, worker.runtime.clone(), worker_ref,
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index 59478818cfa..93361d8e620 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -46,27 +46,18 @@ use task_source::file_reading::FileReadingTaskSource;
 use timers::{IsInterval, OneshotTimerCallback, OneshotTimerHandle, OneshotTimers, TimerCallback};
 use url::Url;
 
-pub fn prepare_workerscope_init(global: GlobalRef,
+pub fn prepare_workerscope_init(global: &GlobalScope,
                                 devtools_sender: Option<IpcSender<DevtoolScriptControlMsg>>) -> WorkerGlobalScopeInit {
-    let global_scope = global.as_global_scope();
-    let worker_id = global_scope.get_next_worker_id();
-    let to_devtools_sender = global_scope.devtools_chan().cloned();
-    let mem_profiler_chan = global_scope.mem_profiler_chan().clone();
-    let time_profiler_chan = global_scope.time_profiler_chan().clone();
-    let constellation_chan = global_scope.constellation_chan().clone();
-    let scheduler_chan = global_scope.scheduler_chan().clone();
-    let pipeline_id = global_scope.pipeline_id();
-    let resource_threads = global_scope.resource_threads().clone();
     let init = WorkerGlobalScopeInit {
-            resource_threads: resource_threads,
-            mem_profiler_chan: mem_profiler_chan,
-            to_devtools_sender: to_devtools_sender,
-            time_profiler_chan: time_profiler_chan,
+            resource_threads: global.resource_threads().clone(),
+            mem_profiler_chan: global.mem_profiler_chan().clone(),
+            to_devtools_sender: global.devtools_chan().cloned(),
+            time_profiler_chan: global.time_profiler_chan().clone(),
             from_devtools_sender: devtools_sender,
-            constellation_chan: constellation_chan,
-            scheduler_chan: scheduler_chan,
-            worker_id: worker_id,
-            pipeline_id: pipeline_id,
+            constellation_chan: global.constellation_chan().clone(),
+            scheduler_chan: global.scheduler_chan().clone(),
+            worker_id: global.get_next_worker_id(),
+            pipeline_id: global.pipeline_id(),
         };
 
     init