diff --git a/src/Wpf.Ui/NavigationService.cs b/src/Wpf.Ui/NavigationService.cs
index 1f6dca3d4..8115fa2b0 100644
--- a/src/Wpf.Ui/NavigationService.cs
+++ b/src/Wpf.Ui/NavigationService.cs
@@ -128,7 +128,7 @@ public bool NavigateWithHierarchy(Type pageType, object? dataContext)
         return NavigationControl!.NavigateWithHierarchy(pageType, dataContext);
     }
 
-    private void ThrowIfNavigationControlIsNull()
+    protected void ThrowIfNavigationControlIsNull()
     {
         if (NavigationControl is null)
         {
@@ -136,7 +136,7 @@ private void ThrowIfNavigationControlIsNull()
         }
     }
 
-    private void ThrowIfPageServiceIsNull()
+    protected void ThrowIfPageServiceIsNull()
     {
         if (_pageService is null)
         {