diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 7c0b1e3..63f9c3f 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 if ! which -- "${1}"; then
   # first arg is not an executable
+  if [ -e /tmp/.X99-lock ]; then rm /tmp/.X99-lock -f; fi
   export DISPLAY=:99
   Xvfb "${DISPLAY}" -nolisten unix &
   exec node /usr/src/app/ "$@"