diff --git a/drydocker/pykolab/build.sh b/drydocker/pykolab/build.sh
index a54ed11..975e3a8 100755
--- a/drydocker/pykolab/build.sh
+++ b/drydocker/pykolab/build.sh
@@ -1,18 +1,20 @@
 #!/bin/bash
 
+set -x
+
 docker run -it \
     -v ${TMPDIR}:/srv \
     -e "ID=${id}" \
     -e "COMMIT=${commit}" \
     -e "DIFFERENTIAL=${differential}" \
     -e "PHAB_CERT=${PHAB_CERT}" \
     -e "PHAB_USER=${PHAB_USER}" \
     -e "PHID=${phid}" \
     -e "URI=${uri}" \
     -e "VCS=${vcs}" \
     -e "TEST_BUILD=${test_build}" \
     -e "TEST_FUNCTIONAL=${test_functional}" \
     -e "TEST_INTEGRATION=${test_integration}" \
     -e "TEST_PERFORMANCE=${test_performance}" \
     -e "TEST_UNIT=${test_unit}" \
     kolab/ci-maipo