diff --git a/test/ddox/test.sh b/test/ddox/test.sh
index bc80e761d9..cb4b47bba3 100755
--- a/test/ddox/test.sh
+++ b/test/ddox/test.sh
@@ -2,11 +2,11 @@
 
 set -e -o pipefail
 
-$DUB build -b ddox --root=default
+(cd default && $DUB build -b ddox)
 grep -qF ddox_project default/docs/index.html
 
 $DUB add-local custom-tool
-$DUB build -b ddox --root=custom
+(cd custom && $DUB build -b ddox)
 grep -qF custom-tool custom/docs/custom_tool_output
 diff custom-tool/public/copied custom/docs/copied
 $DUB remove-local custom-tool