diff --git a/xpcom/tests/services/makefile.win b/xpcom/tests/services/makefile.win
index 1bcb6101c18..ce847a95a1e 100644
--- a/xpcom/tests/services/makefile.win
+++ b/xpcom/tests/services/makefile.win
@@ -16,6 +16,7 @@
 # Reserved.
 
 DEPTH=..\..\..
+include <$(DEPTH)/config/config.mak>
 
 IGNORE_MANIFEST=1