diff --git a/src/webkit.cs b/src/webkit.cs
index a856d7517355..ebe772e853c8 100644
--- a/src/webkit.cs
+++ b/src/webkit.cs
@@ -2429,6 +2429,7 @@ partial interface WebPolicyDelegate {
 			<summary>To be added.</summary>
 			<remarks>To be added.</remarks>
 			""")]
+		[NoDefaultValue]
 		void DecidePolicyForNavigation (WebView webView, NSDictionary actionInformation, NSUrlRequest request, WebFrame frame, NSObject decisionToken);
 
 		/// <param name="webView">To be added.</param>
@@ -2442,6 +2443,7 @@ partial interface WebPolicyDelegate {
 			<summary>To be added.</summary>
 			<remarks>To be added.</remarks>
 			""")]
+		[NoDefaultValue]
 		void DecidePolicyForNewWindow (WebView webView, NSDictionary actionInformation, NSUrlRequest request, string newFrameName, NSObject decisionToken);
 
 		/// <param name="webView">To be added.</param>
@@ -2455,6 +2457,7 @@ partial interface WebPolicyDelegate {
 			<summary>To be added.</summary>
 			<remarks>To be added.</remarks>
 			""")]
+		[NoDefaultValue]
 		void DecidePolicyForMimeType (WebView webView, string mimeType, NSUrlRequest request, WebFrame frame, NSObject decisionToken);
 
 		/// <param name="webView">To be added.</param>
diff --git a/tests/monotouch-test/WebKit/WebViewTest.cs b/tests/monotouch-test/WebKit/WebViewTest.cs
new file mode 100644
index 000000000000..17639a5bb6c1
--- /dev/null
+++ b/tests/monotouch-test/WebKit/WebViewTest.cs
@@ -0,0 +1,56 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#nullable enable
+
+#if __MACOS__
+
+using WebKit;
+
+namespace MonoTouchFixtures.WebKit {
+	[TestFixture]
+	[Preserve (AllMembers = true)]
+	public class WebViewTest {
+		[Test]
+		public void PolicyDelegateSelectors ()
+		{
+			using var view = new WebView ();
+			view.UnableToImplementPolicy += (sender, e) => { };
+
+			var policyDelegate = view.WeakPolicyDelegate ?? throw new AssertionException ("Policy delegate was not created.");
+
+			var navigation = new Selector ("webView:decidePolicyForNavigationAction:request:frame:decisionListener:");
+			var newWindow = new Selector ("webView:decidePolicyForNewWindowAction:request:newFrameName:decisionListener:");
+			var mimeType = new Selector ("webView:decidePolicyForMIMEType:request:frame:decisionListener:");
+			var failure = new Selector ("webView:unableToImplementPolicyWithError:frame:");
+
+			void AssertSelectors (bool handlesNavigation, bool handlesNewWindow, bool handlesMimeType)
+			{
+				Assert.That (policyDelegate.RespondsToSelector (navigation), Is.EqualTo (handlesNavigation), "Navigation");
+				Assert.That (policyDelegate.RespondsToSelector (newWindow), Is.EqualTo (handlesNewWindow), "New window");
+				Assert.That (policyDelegate.RespondsToSelector (mimeType), Is.EqualTo (handlesMimeType), "MIME type");
+				Assert.That (policyDelegate.RespondsToSelector (failure), Is.True, "Failure notification");
+			}
+
+			EventHandler<WebNavigationPolicyEventArgs> navigationHandler = (sender, e) => { };
+			EventHandler<WebNewWindowPolicyEventArgs> newWindowHandler = (sender, e) => { };
+			EventHandler<WebMimeTypePolicyEventArgs> mimeTypeHandler = (sender, e) => { };
+
+			AssertSelectors (false, false, false);
+			view.DecidePolicyForNavigation += navigationHandler;
+			AssertSelectors (true, false, false);
+			view.DecidePolicyForNewWindow += newWindowHandler;
+			AssertSelectors (true, true, false);
+			view.DecidePolicyForMimeType += mimeTypeHandler;
+			AssertSelectors (true, true, true);
+			view.DecidePolicyForNavigation -= navigationHandler;
+			AssertSelectors (false, true, true);
+			view.DecidePolicyForNewWindow -= newWindowHandler;
+			AssertSelectors (false, false, true);
+			view.DecidePolicyForMimeType -= mimeTypeHandler;
+			AssertSelectors (false, false, false);
+		}
+	}
+}
+
+#endif