diff --git a/drydocker/copenhagen/test_unit.sh b/drydocker/copenhagen/test_unit.sh
index 3ad4b82..bd65a3e 100755
--- a/drydocker/copenhagen/test_unit.sh
+++ b/drydocker/copenhagen/test_unit.sh
@@ -1,13 +1,16 @@
 #!/bin/bash
 
 pushd /srv/${PACKAGE}.git
+
 pushd tests
-phpunit --debug ; retval=$?
+phpunit \
+    --include-path /usr/share/roundcubemail/program/lib/ \
+    --debug ; retval=$?
 
 if [ ${retval} -ne 0 ]; then
     echo "FAILED unit tests."
     exit 1
 fi
 
 popd
 popd