diff --git a/app/Jobs/ApplicationDeploymentJob.php b/app/Jobs/ApplicationDeploymentJob.php
index 7168aea5f..48547c4d9 100644
--- a/app/Jobs/ApplicationDeploymentJob.php
+++ b/app/Jobs/ApplicationDeploymentJob.php
@@ -2280,9 +2280,9 @@ private function set_coolify_variables()
             $fqdn = $this->preview->fqdn;
         }
         if (isset($fqdn)) {
-            $url = Url::fromString($fqdn);
-            $fqdn = $url->getHost();
-            $url = $url->withHost($fqdn)->withPort(null)->__toString();
+            $domains = str($fqdn)->explode(',')->map(fn (string $domain) => trim($domain))->filter();
+            $url = $domains->map(fn (string $domain) => Url::fromString($domain)->withPort(null)->__toString())->implode(',');
+            $fqdn = $domains->map(fn (string $domain) => Url::fromString($domain)->getHost())->implode(',');
             if ((int) $this->application->compose_parsing_version >= 3) {
                 $this->coolify_variables .= 'COOLIFY_URL='.escapeShellValue($url).' ';
                 $this->coolify_variables .= 'COOLIFY_FQDN='.escapeShellValue($fqdn).' ';
diff --git a/tests/Unit/ApplicationDeploymentCoolifyUrlDomainsTest.php b/tests/Unit/ApplicationDeploymentCoolifyUrlDomainsTest.php
new file mode 100644
index 000000000..f6684718e
--- /dev/null
+++ b/tests/Unit/ApplicationDeploymentCoolifyUrlDomainsTest.php
@@ -0,0 +1,94 @@
+<?php
+
+use App\Jobs\ApplicationDeploymentJob;
+use App\Models\Application;
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\StandaloneDocker;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+uses(TestCase::class, RefreshDatabase::class);
+
+class TestableCoolifyUrlDeploymentJob extends ApplicationDeploymentJob
+{
+    public function __construct() {}
+
+    public function execute_remote_command(...$commands): void {}
+}
+
+function coolifyVariablesForFqdn(string $fqdn, string $composeParsingVersion = '3'): string
+{
+    $team = Team::create([
+        'name' => 'Coolify Url Team',
+        'personal_team' => false,
+        'show_boarding' => false,
+    ]);
+    $project = Project::create([
+        'name' => 'Coolify Url Project',
+        'team_id' => $team->id,
+    ]);
+    $environment = Environment::where('project_id', $project->id)->firstOrFail();
+    $server = Server::factory()->create(['team_id' => $team->id]);
+    $destination = $server->standaloneDockers()->firstOrFail();
+    $application = Application::factory()->create([
+        'environment_id' => $environment->id,
+        'destination_id' => $destination->id,
+        'destination_type' => StandaloneDocker::class,
+        'build_pack' => 'dockercompose',
+        'fqdn' => $fqdn,
+    ]);
+
+    // The created hook resets this, so it has to be set afterwards.
+    $application->compose_parsing_version = $composeParsingVersion;
+    $application->save();
+
+    $job = new TestableCoolifyUrlDeploymentJob;
+    $reflection = new ReflectionClass(ApplicationDeploymentJob::class);
+
+    foreach ([
+        'application' => $application->fresh(),
+        'pull_request_id' => 0,
+        'commit' => 'HEAD',
+    ] as $property => $value) {
+        $reflection->getProperty($property)->setValue($job, $value);
+    }
+
+    $reflection->getMethod('set_coolify_variables')->invoke($job);
+
+    return $reflection->getProperty('coolify_variables')->getValue($job);
+}
+
+it('keeps every domain intact when an application has multiple domains', function () {
+    $variables = coolifyVariablesForFqdn('https://a.example.com,https://b.example.com');
+
+    expect($variables)
+        ->toContain("COOLIFY_URL='https://a.example.com,https://b.example.com'")
+        ->toContain("COOLIFY_FQDN='a.example.com,b.example.com'");
+});
+
+it('strips the port from every domain when an application has multiple domains', function () {
+    $variables = coolifyVariablesForFqdn('https://a.example.com:8080,https://b.example.com:9000');
+
+    expect($variables)
+        ->toContain("COOLIFY_URL='https://a.example.com,https://b.example.com'")
+        ->toContain("COOLIFY_FQDN='a.example.com,b.example.com'");
+});
+
+it('keeps every domain intact on the legacy compose parsing version', function () {
+    $variables = coolifyVariablesForFqdn('https://a.example.com,https://b.example.com', '2');
+
+    expect($variables)
+        ->toContain("COOLIFY_URL='a.example.com,b.example.com'")
+        ->toContain("COOLIFY_FQDN='https://a.example.com,https://b.example.com'");
+});
+
+it('still resolves a single domain', function () {
+    $variables = coolifyVariablesForFqdn('https://a.example.com');
+
+    expect($variables)
+        ->toContain("COOLIFY_URL='https://a.example.com'")
+        ->toContain("COOLIFY_FQDN='a.example.com'");
+});