diff --git a/xpcom/threads/nsIThreadPool.h b/xpcom/threads/nsIThreadPool.h
new file mode 100644
index 000000000000..2ab6b844cffb
--- /dev/null
+++ b/xpcom/threads/nsIThreadPool.h
@@ -0,0 +1 @@
+// dummy, until I can add nsIThreadPool.idl