diff --git a/content/media/webspeech/synth/SpeechSynthesis.h b/content/media/webspeech/synth/SpeechSynthesis.h
index 2139114b3acf..b51480291022 100644
--- a/content/media/webspeech/synth/SpeechSynthesis.h
+++ b/content/media/webspeech/synth/SpeechSynthesis.h
@@ -62,7 +62,7 @@ private:
 
   nsCOMPtr<nsPIDOMWindow> mParent;
 
-  nsTArray<nsRefPtr<SpeechSynthesisUtterance>> mSpeechQueue;
+  nsTArray<nsRefPtr<SpeechSynthesisUtterance> > mSpeechQueue;
 
   nsRefPtr<nsSpeechTask> mCurrentTask;