diff --git a/1.21/Dockerfile b/1.21/Dockerfile
index 11c2129..237e0eb 100644
--- a/1.21/Dockerfile
+++ b/1.21/Dockerfile
@@ -142,6 +142,8 @@ COPY docker-entrypoint.sh /docker-entrypoint.sh
 COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
 COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
 COPY 30-tune-worker-processes.sh /docker-entrypoint.d
+
+RUN chmod +x /docker-entrypoint.sh
 ENTRYPOINT ["/docker-entrypoint.sh"]
 
 EXPOSE 8080