diff --git a/mozilla/layout/Makefile.in b/mozilla/layout/Makefile.in
index c5b40274e6e..987ff7299a3 100644
--- a/mozilla/layout/Makefile.in
+++ b/mozilla/layout/Makefile.in
@@ -72,6 +72,7 @@ endif
 DIRS           += build
 
 ifdef ENABLE_TESTS
+DIRS           += tools/reftest
 ifndef MOZ_ENABLE_LIBXUL
 TOOL_DIRS	+= html/tests
 endif