diff --git a/app/Models/Application.php b/app/Models/Application.php
index 084eb0fb25..ce6ca04afe 100644
--- a/app/Models/Application.php
+++ b/app/Models/Application.php
@@ -706,13 +706,13 @@ class Application extends BaseModel
         return false;
     }
 
-    public function is_github_based(): bool
+    /**
+     * Watch paths filter Git webhook deployments. Deploy-key applications have no
+     * source but receive manual webhooks, so a source is not required.
+     */
+    public function supportsWatchPaths(): bool
     {
-        if (data_get($this, 'source')) {
-            return true;
-        }
-
-        return false;
+        return $this->git_based() && ! $this->is_public_repository();
     }
 
     public function isGithubAppSource(): bool
diff --git a/resources/views/livewire/project/application/general.blade.php b/resources/views/livewire/project/application/general.blade.php
index eb3e1b8f4e..8ef260d19d 100644
--- a/resources/views/livewire/project/application/general.blade.php
+++ b/resources/views/livewire/project/application/general.blade.php
@@ -249,7 +249,7 @@
                                             </div>
                                         @endif
                                 </div>
-                                @if ($this->application->is_github_based() && !$this->application->is_public_repository())
+                                @if ($this->application->supportsWatchPaths())
                                     <div class="pt-4">
                                         <x-forms.textarea
                                             helper="Order-based pattern matching to filter Git webhook deployments. Enter one pattern per line. Commas do not separate patterns. Supports wildcards (*, **, ?) and negation (!). Last matching pattern wins."
@@ -272,7 +272,7 @@
                                     @endif
                                 @endif
                             </x-forms.repository-paths>
-                            @if ($this->application->is_github_based() && !$this->application->is_public_repository())
+                            @if ($this->application->supportsWatchPaths())
                                 <div class="pb-4">
                                     <x-forms.textarea
                                         helper="Order-based pattern matching to filter Git webhook deployments. Enter one pattern per line. Commas do not separate patterns. Supports wildcards (*, **, ?) and negation (!). Last matching pattern wins."
diff --git a/tests/Feature/ApplicationWatchPathsFieldVisibilityTest.php b/tests/Feature/ApplicationWatchPathsFieldVisibilityTest.php
new file mode 100644
index 0000000000..ec0fb2dbb5
--- /dev/null
+++ b/tests/Feature/ApplicationWatchPathsFieldVisibilityTest.php
@@ -0,0 +1,104 @@
+<?php
+
+use App\Livewire\Project\Application\General;
+use App\Models\Application;
+use App\Models\Environment;
+use App\Models\GithubApp;
+use App\Models\InstanceSettings;
+use App\Models\PrivateKey;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\StandaloneDocker;
+use App\Models\Team;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Livewire\Livewire;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    $this->team = Team::factory()->create();
+    $this->user = User::factory()->create();
+    $this->team->members()->attach($this->user->id, ['role' => 'owner']);
+
+    $this->actingAs($this->user);
+    session(['currentTeam' => $this->team]);
+    InstanceSettings::unguarded(function () {
+        InstanceSettings::updateOrCreate(['id' => 0], []);
+    });
+
+    $project = Project::factory()->create(['team_id' => $this->team->id]);
+    $this->environment = Environment::factory()->create(['project_id' => $project->id]);
+    $server = Server::factory()->create(['team_id' => $this->team->id]);
+    $this->destination = StandaloneDocker::where('server_id', $server->id)->first()
+        ?? StandaloneDocker::factory()->create(['server_id' => $server->id, 'network' => 'coolify-test']);
+});
+
+function watchPathsTestApplication(array $attributes): Application
+{
+    return Application::factory()->create([
+        'environment_id' => test()->environment->id,
+        'destination_id' => test()->destination->id,
+        'destination_type' => StandaloneDocker::class,
+        'git_repository' => 'git@github.com:acme/monorepo.git',
+        ...$attributes,
+    ]);
+}
+
+function watchPathsTestGithubApp(bool $isPublic): GithubApp
+{
+    return GithubApp::create([
+        'name' => $isPublic ? 'public-github' : 'private-github-app',
+        'team_id' => test()->team->id,
+        'api_url' => 'https://api.github.com',
+        'html_url' => 'https://github.com',
+        'is_public' => $isPublic,
+    ]);
+}
+
+/**
+ * Regression for #12373: deploy-key applications have no source, but manual Git
+ * webhooks still filter their deployments by watch paths.
+ */
+it('shows the watch paths field for deploy key applications', function (string $buildPack) {
+    $privateKey = PrivateKey::factory()->create(['team_id' => $this->team->id]);
+    $application = watchPathsTestApplication([
+        'build_pack' => $buildPack,
+        'private_key_id' => $privateKey->id,
+    ]);
+
+    Livewire::test(General::class, ['application' => $application->fresh()])
+        ->assertSee('Watch paths');
+})->with(['dockercompose', 'dockerfile', 'nixpacks']);
+
+it('shows the watch paths field for private GitHub App applications', function () {
+    $githubApp = watchPathsTestGithubApp(isPublic: false);
+    $application = watchPathsTestApplication([
+        'source_id' => $githubApp->id,
+        'source_type' => GithubApp::class,
+    ]);
+
+    Livewire::test(General::class, ['application' => $application->fresh()])
+        ->assertSee('Watch paths');
+});
+
+it('hides the watch paths field for public repository applications', function () {
+    $githubApp = watchPathsTestGithubApp(isPublic: true);
+    $application = watchPathsTestApplication([
+        'source_id' => $githubApp->id,
+        'source_type' => GithubApp::class,
+    ]);
+
+    Livewire::test(General::class, ['application' => $application->fresh()])
+        ->assertDontSee('Watch paths');
+});
+
+it('hides the watch paths field for applications without a Git repository', function () {
+    $application = watchPathsTestApplication([
+        'build_pack' => 'dockerfile',
+        'dockerfile' => "FROM nginx:alpine\n",
+    ]);
+
+    Livewire::test(General::class, ['application' => $application->fresh()])
+        ->assertDontSee('Watch paths');
+});