diff --git a/intl/chardet/makefile.win b/intl/chardet/makefile.win
index 4142281fd98..b50e86ef33f 100644
--- a/intl/chardet/makefile.win
+++ b/intl/chardet/makefile.win
@@ -17,5 +17,5 @@
 DEPTH=..\..
 IGNORE_MANIFEST=1
 
-DIRS= public src 
+DIRS= public src tests
 include <$(DEPTH)\config\rules.mak>