diff --git a/components/script/dom/bindings/global.rs b/components/script/dom/bindings/global.rs
index ecca46a5a5e..67ed8766932 100644
--- a/components/script/dom/bindings/global.rs
+++ b/components/script/dom/bindings/global.rs
@@ -25,7 +25,7 @@ use libc;
 use profile_traits::time;
 use script_runtime::{CommonScriptMsg, EnqueuedPromiseCallback, ScriptChan};
 use script_runtime::{ScriptPort, maybe_take_panic_result};
-use script_thread::{MainThreadScriptChan, RunnableWrapper, ScriptThread};
+use script_thread::{RunnableWrapper, ScriptThread};
 use script_traits::MsDuration;
 use std::ffi::CString;
 use std::panic;
@@ -67,16 +67,6 @@ impl<'a> GlobalRef<'a> {
         }
     }
 
-    /// `ScriptChan` used to send messages to the event loop of this global's
-    /// thread.
-    pub fn script_chan(&self) -> Box<ScriptChan + Send> {
-        match *self {
-            GlobalRef::Window(ref window) =>
-                MainThreadScriptChan(window.main_thread_script_chan().clone()).clone(),
-            GlobalRef::Worker(ref worker) => worker.script_chan(),
-        }
-    }
-
     /// `ScriptChan` used to send messages to the event loop of this global's
     /// thread.
     pub fn networking_task_source(&self) -> Box<ScriptChan + Send> {
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 71405239122..7e5f0407e36 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -23,6 +23,8 @@ use js::jsapi::{HandleValue, JS_GetContext, JS_GetObjectRuntime, JSContext};
 use msg::constellation_msg::PipelineId;
 use net_traits::{CoreResourceThread, ResourceThreads, IpcSend};
 use profile_traits::{mem, time};
+use script_runtime::ScriptChan;
+use script_thread::MainThreadScriptChan;
 use script_traits::{ScriptMsg as ConstellationMsg, TimerEventRequest};
 use std::cell::Cell;
 use std::collections::HashMap;
@@ -257,6 +259,17 @@ impl GlobalScope {
     pub fn core_resource_thread(&self) -> CoreResourceThread {
         self.resource_threads().sender()
     }
+
+    /// `ScriptChan` to send messages to the event loop of this global scope.
+    pub fn script_chan(&self) -> Box<ScriptChan + Send> {
+        if let Some(window) = self.downcast::<Window>() {
+            return MainThreadScriptChan(window.main_thread_script_chan().clone()).clone();
+        }
+        if let Some(worker) = self.downcast::<WorkerGlobalScope>() {
+            return worker.script_chan();
+        }
+        unreachable!();
+    }
 }
 
 fn timestamp_in_ms(time: Timespec) -> u64 {
diff --git a/components/script/dom/websocket.rs b/components/script/dom/websocket.rs
index aa2a61b6c38..ac1cf53b2ae 100644
--- a/components/script/dom/websocket.rs
+++ b/components/script/dom/websocket.rs
@@ -330,8 +330,10 @@ impl WebSocket {
                 address: address,
             };
 
-            let global = self.global();
-            global.r().script_chan().send(CommonScriptMsg::RunnableMsg(WebSocketEvent, task)).unwrap();
+            self.global_scope()
+                .script_chan()
+                .send(CommonScriptMsg::RunnableMsg(WebSocketEvent, task))
+                .unwrap();
         }
 
         Ok(true)
diff --git a/components/script/dom/worker.rs b/components/script/dom/worker.rs
index 1ef6242720d..035aa83bdf9 100644
--- a/components/script/dom/worker.rs
+++ b/components/script/dom/worker.rs
@@ -109,7 +109,7 @@ impl Worker {
 
         DedicatedWorkerGlobalScope::run_worker_scope(
             init, worker_url, devtools_receiver, worker.runtime.clone(), worker_ref,
-            global.script_chan(), sender, receiver, worker_load_origin, closing);
+            global_scope.script_chan(), sender, receiver, worker_load_origin, closing);
 
         Ok(worker)
     }