diff --git a/module/Core/src/Validation/ShortUrlInputFilter.php b/module/Core/src/Validation/ShortUrlInputFilter.php
index 96896e94..6cd578fb 100644
--- a/module/Core/src/Validation/ShortUrlInputFilter.php
+++ b/module/Core/src/Validation/ShortUrlInputFilter.php
@@ -77,7 +77,7 @@ class ShortUrlInputFilter extends InputFilter
         //       empty, is by using the deprecated setContinueIfEmpty
         $customSlug = $this->createInput(self::CUSTOM_SLUG, false)->setContinueIfEmpty(true);
         $customSlug->getFilterChain()->attach(new Filter\Callback(
-            static fn (mixed $value) => is_string($value) ? str_replace([' ', '/'], ['-', ''], $value) : $value,
+            static fn (mixed $value) => is_string($value) ? str_replace([' ', '/'], '-', $value) : $value,
         ));
         $customSlug->getValidatorChain()->attach(new Validator\NotEmpty([
             Validator\NotEmpty::STRING,
diff --git a/module/Core/test/Model/ShortUrlMetaTest.php b/module/Core/test/Model/ShortUrlMetaTest.php
index ec2d314e..1933b3b6 100644
--- a/module/Core/test/Model/ShortUrlMetaTest.php
+++ b/module/Core/test/Model/ShortUrlMetaTest.php
@@ -57,10 +57,6 @@ class ShortUrlMetaTest extends TestCase
             ShortUrlInputFilter::LONG_URL => 'foo',
             ShortUrlInputFilter::SHORT_CODE_LENGTH => 3,
         ]];
-        yield [[
-            ShortUrlInputFilter::LONG_URL => 'foo',
-            ShortUrlInputFilter::CUSTOM_SLUG => '/',
-        ]];
         yield [[
             ShortUrlInputFilter::LONG_URL => 'foo',
             ShortUrlInputFilter::CUSTOM_SLUG => '',
@@ -107,6 +103,7 @@ class ShortUrlMetaTest extends TestCase
         yield ['foo bar', 'foo-bar'];
         yield ['foo bar baz', 'foo-bar-baz'];
         yield ['foo bar-baz', 'foo-bar-baz'];
+        yield ['foo/bar/baz', 'foo-bar-baz'];
         yield ['wp-admin.php', 'wp-admin.php'];
         yield ['UPPER_lower', 'UPPER_lower'];
         yield ['more~url_special.chars', 'more~url_special.chars'];