diff --git a/mozilla/base/makefile.win b/mozilla/base/makefile.win
index cd525997c64..b7f84e8a5a2 100644
--- a/mozilla/base/makefile.win
+++ b/mozilla/base/makefile.win
@@ -18,6 +18,6 @@
 DEPTH=..
 IGNORE_MANIFEST=1
 
-DIRS=public src 
+DIRS=public src tests 
 
 include <$(DEPTH)\config\rules.mak>