diff --git a/Dockerfile b/Dockerfile
index 47ce0bf..2cafcd6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,5 +13,6 @@ RUN mkdir -p /var/spool/cron/crontabs /var/log
 RUN touch /var/log/cron.log
 
 COPY entry.sh /entry.sh
+RUN chmod +x entry.sh
 COPY --from=builder /tmp/dnsupdater/dnsupdater .
 ENTRYPOINT ["/entry.sh"]