diff --git a/mozilla/intl/uconv/Makefile.in b/mozilla/intl/uconv/Makefile.in
index f32c5b30a89..76a9bc34c3b 100644
--- a/mozilla/intl/uconv/Makefile.in
+++ b/mozilla/intl/uconv/Makefile.in
@@ -28,6 +28,8 @@ DIRS += ucvja ucvja2
 
 DIRS += ucvlatin
 
-DIRS += tests 
+ifdef ENABLE_TESTS
+DIRS += tests
+endif
 
 include $(topsrcdir)/config/rules.mk