diff --git a/apps/ui/src/routes/applications/[id]/index.svelte b/apps/ui/src/routes/applications/[id]/index.svelte
index 2679f4418..acfe3c686 100644
--- a/apps/ui/src/routes/applications/[id]/index.svelte
+++ b/apps/ui/src/routes/applications/[id]/index.svelte
@@ -1074,6 +1074,7 @@
 								readonly={!$appSession.isAdmin}
 								name="port"
 								id="port"
+								required={!!dockerComposeConfiguration[service.name].fqdn}
 								bind:value={dockerComposeConfiguration[service.name].port}
 							/>
 						</div>