diff --git a/src/Transformations/Filter.php b/src/Transformations/Filter.php
index 431fa1c..c47cc1c 100644
--- a/src/Transformations/Filter.php
+++ b/src/Transformations/Filter.php
@@ -48,7 +48,11 @@ public static function validate(string $key, ...$args): bool
     public static function generateUrl(string $url, array $values): string
     {
         // -/filter/:name/:amount/
-        $url .= '-/filter/' . $values['name'] . '/' . $values['amount'] . '/';
+        if ($values['amount'] === null) {
+            $url .= '-/filter/' . $values['name'] . '/';
+        } else {
+            $url .= '-/filter/' . $values['name'] . '/' . $values['amount'] . '/';
+        }
 
         return $url;
     }
diff --git a/tests/TransformationTest.php b/tests/TransformationTest.php
index 84ffc5f..7065191 100644
--- a/tests/TransformationTest.php
+++ b/tests/TransformationTest.php
@@ -199,6 +199,17 @@
     expect($url)->toBe('https://ucarecdn.com/12a3456b-c789-1234-1de2-3cfa83096e25/-/strip_meta/sensitive/');
 });
 
+it('omits the amount segment in filter when no amount is given', function () {
+    $uuid = '12a3456b-c789-1234-1de2-3cfa83096e25';
+
+    $url = (string) uploadcare($uuid)->filter('adaris');
+    expect($url)->toContain('-/filter/adaris/');
+    expect($url)->not->toContain('adaris//');
+
+    $url = (string) uploadcare($uuid)->filter('adaris', 50);
+    expect($url)->toContain('-/filter/adaris/50/');
+});
+
 it('honors the boolean argument in autoRotate', function () {
     $uuid = '12a3456b-c789-1234-1de2-3cfa83096e25';