diff --git a/entrypoint.sh b/entrypoint.sh
index 2520527..67be24e 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -19,7 +19,7 @@ mcli alias set s3 https://s3.tobiasmanske.de "${REPO_ACCESS_KEY}" "${REPO_SECRET
 LOCK=""
 
 while [[ "${LOCK}" != "${PIPELINE_ID}" ]]; do
-	if [[ ${DEBUG} == "true" ]]; then
+	if [[ ${DEBUG:-} == "true" ]]; then
 		echo "Debug mode, not waiting for lock"
 		break
 	fi
@@ -115,7 +115,7 @@ echo QUEUE
 echo
 cat queue
 
-if [[ ${DEBUG} == "true" ]]; then
+if [[ ${DEBUG:-} == "true" ]]; then
 	echo "Debug mode, not building anything."
 	exit 0
 fi