diff --git a/xpcom/tests/services/MyService.cpp b/xpcom/tests/services/MyService.cpp
index 48aa2f13be2..222d0b60919 100644
--- a/xpcom/tests/services/MyService.cpp
+++ b/xpcom/tests/services/MyService.cpp
@@ -19,6 +19,7 @@
 #include "MyService.h"
 #include "nsIServiceManager.h"
 #include <stdio.h>
+#include "nsIFactory.h"
 
 ////////////////////////////////////////////////////////////////////////////////