diff --git a/components/script/dom/bindings/global.rs b/components/script/dom/bindings/global.rs
index 26d7c061503..051a28439bd 100644
--- a/components/script/dom/bindings/global.rs
+++ b/components/script/dom/bindings/global.rs
@@ -18,8 +18,6 @@ use js::{JSCLASS_IS_DOMJSCLASS, JSCLASS_IS_GLOBAL};
 use js::glue::{IsWrapper, UnwrapObject};
 use js::jsapi::{CurrentGlobalOrNull, GetGlobalForObjectCrossCompartment};
 use js::jsapi::{JSContext, JSObject, JS_GetClass};
-use script_runtime::CommonScriptMsg;
-use script_thread::ScriptThread;
 use task_source::file_reading::FileReadingTaskSource;
 
 /// A freely-copyable reference to a rooted global object.
@@ -65,15 +63,6 @@ impl<'a> GlobalRef<'a> {
             GlobalRef::Worker(ref worker) => worker.file_reading_task_source(),
         }
     }
-
-    /// Process a single event as if it were the next event in the thread queue for
-    /// this global.
-    pub fn process_event(&self, msg: CommonScriptMsg) {
-        match *self {
-            GlobalRef::Window(_) => ScriptThread::process_event(msg),
-            GlobalRef::Worker(ref worker) => worker.process_event(msg),
-        }
-    }
 }
 
 impl<'a> Reflectable for GlobalRef<'a> {
diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index 0b3b609d54b..fd5046c64c6 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -26,7 +26,7 @@ use libc;
 use msg::constellation_msg::PipelineId;
 use net_traits::{CoreResourceThread, ResourceThreads, IpcSend};
 use profile_traits::{mem, time};
-use script_runtime::{EnqueuedPromiseCallback, ScriptChan};
+use script_runtime::{CommonScriptMsg, EnqueuedPromiseCallback, ScriptChan};
 use script_runtime::{ScriptPort, maybe_take_panic_result};
 use script_thread::{MainThreadScriptChan, RunnableWrapper, ScriptThread};
 use script_traits::{MsDuration, ScriptMsg as ConstellationMsg, TimerEvent};
@@ -445,6 +445,18 @@ impl GlobalScope {
         }
         unreachable!();
     }
+
+    /// Process a single event as if it were the next event
+    /// in the thread queue for this global scope.
+    pub fn process_event(&self, msg: CommonScriptMsg) {
+        if self.is::<Window>() {
+            return ScriptThread::process_event(msg);
+        }
+        if let Some(worker) = self.downcast::<WorkerGlobalScope>() {
+            return worker.process_event(msg);
+        }
+        unreachable!();
+    }
 }
 
 fn timestamp_in_ms(time: Timespec) -> u64 {
diff --git a/components/script/dom/xmlhttprequest.rs b/components/script/dom/xmlhttprequest.rs
index e8254be3e70..4429ec71380 100644
--- a/components/script/dom/xmlhttprequest.rs
+++ b/components/script/dom/xmlhttprequest.rs
@@ -1309,7 +1309,7 @@ impl XMLHttpRequest {
 
         if let Some(script_port) = script_port {
             loop {
-                global.process_event(script_port.recv().unwrap());
+                global_scope.process_event(script_port.recv().unwrap());
                 let context = context.lock().unwrap();
                 let sync_status = context.sync_status.borrow();
                 if let Some(ref status) = *sync_status {