diff --git a/src/Pages/SubsitesVirtualPage.php b/src/Pages/SubsitesVirtualPage.php
index d5ab24e..d36cb4d 100644
--- a/src/Pages/SubsitesVirtualPage.php
+++ b/src/Pages/SubsitesVirtualPage.php
@@ -222,15 +222,13 @@ class SubsitesVirtualPage extends VirtualPage
     {
         $isValid = parent::validURLSegment();
 
-        $filters = [
-            'URLSegment' => $this->URLSegment,
-        ];
-
         // Veto the validation rules if its false. In this case, some logic
         // needs to be duplicated from parent to find out the exact reason the validation failed.
         if (!$isValid) {
-            // Exclude the current page from the filter
-            $filters['ID:not'] = $this->ID;
+            $filters = [
+                'URLSegment' => $this->URLSegment,
+                'ID:not' => $this->ID,
+            ];
 
             if (Config::inst()->get(SiteTree::class, 'nested_urls')) {
                 $filters['ParentID'] = $this->ParentID ?: 0;
diff --git a/tests/php/SubsitesVirtualPageTest.php b/tests/php/SubsitesVirtualPageTest.php
index 99e9646..527927f 100644
--- a/tests/php/SubsitesVirtualPageTest.php
+++ b/tests/php/SubsitesVirtualPageTest.php
@@ -311,4 +311,41 @@ class SubsitesVirtualPageTest extends BaseSubsiteTest
             Versioned::prepopulate_versionnumber_cache(SiteTree::class, 'Live', [$p->ID]);
         }
     }
+
+    public function testValidURLSegmentWithUniquePageAndNestedURLs()
+    {
+        SiteTree::config()->set('nested_urls', true);
+
+        $newPage = new SubsitesVirtualPage();
+        $newPage->Title = 'My new page';
+        $newPage->URLSegment = 'my-new-page';
+
+        $this->assertTrue($newPage->validURLSegment());
+    }
+
+    public function testValidURLSegmentWithExistingPageInSubsite()
+    {
+        $subsite1 = $this->objFromFixture(Subsite::class, 'subsite1');
+        Subsite::changeSubsite($subsite1->ID);
+
+        SiteTree::config()->set('nested_urls', false);
+
+        $similarContactUsPage = new SubsitesVirtualPage();
+        $similarContactUsPage->Title = 'Similar to Contact Us in Subsite 1';
+        $similarContactUsPage->URLSegment = 'contact-us';
+
+        $this->assertFalse($similarContactUsPage->validURLSegment());
+    }
+
+    public function testValidURLSegmentWithExistingPageInAnotherSubsite()
+    {
+        $subsite1 = $this->objFromFixture(Subsite::class, 'subsite1');
+        Subsite::changeSubsite($subsite1->ID);
+
+        $similarStaffPage = new SubsitesVirtualPage();
+        $similarStaffPage->Title = 'Similar to Staff page in main site';
+        $similarStaffPage->URLSegment = 'staff';
+
+        $this->assertFalse($similarStaffPage->validURLSegment());
+    }
 }