diff --git a/xpcom/threads/Scheduler.h b/xpcom/threads/Scheduler.h
index fe7f63b3bb1c..09445a31024b 100644
--- a/xpcom/threads/Scheduler.h
+++ b/xpcom/threads/Scheduler.h
@@ -10,7 +10,9 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/EventQueue.h"
 #include "mozilla/RefPtr.h"
+#include "mozilla/ThreadLocal.h"
 #include "mozilla/UniquePtr.h"
+#include "nsTArray.h"
 
 // Windows silliness. winbase.h defines an empty no-argument Yield macro.
 #undef Yield