diff --git a/lektor/docker/entrypoint.sh b/lektor/docker/entrypoint.sh
index f7e94d2..e4c6fcb 100644
--- a/lektor/docker/entrypoint.sh
+++ b/lektor/docker/entrypoint.sh
@@ -2,7 +2,7 @@
 
 sh -c ". /opt/venv/bin/activate && exec python /opt/lektor/scripts/calendar-fetcher.py ${CALENDAR_URL} > /opt/lektor/project/content/termine/contents.lr"
 # TODO As the file reads from the same file as it's output is afterwards piped into this leads to synchronization/buffering issues, we therefore write to a temporaray file and move it to the right place in a subsequent step
-tempfile="/tmp/contents.lr" 
+tempfile=$(mktemp)
 sh -c ". /opt/venv/bin/activate && exec python /opt/lektor/scripts/calendar-fetcher-main.py ${CALENDAR_URL} > $tempfile"
 mv $tempfile /opt/lektor/project/content/contents.lr
 /root/.local/bin/lektor --project /opt/lektor/project server --host 0.0.0.0
\ No newline at end of file