diff --git a/tests/mmptest/src/MMPTest.cs b/tests/mmptest/src/MMPTest.cs
index fdb26caaf9..142ce91c82 100644
--- a/tests/mmptest/src/MMPTest.cs
+++ b/tests/mmptest/src/MMPTest.cs
@@ -842,7 +842,7 @@ namespace Xamarin.MMP.Tests
 						"<LinkMode>Full</LinkMode>",
 				};
 				var rv = TI.TestUnifiedExecutable (test, shouldFail: false);
-				rv.Messages.AssertWarning (132, $"Unknown optimization: '{opt}'. Valid optimizations are: remove-uithread-checks, dead-code-elimination, inline-isdirectbinding, inline-intptr-size, blockliteral-setupblock.");
+				rv.Messages.AssertWarning (132, $"Unknown optimization: '{opt}'. Valid optimizations are: remove-uithread-checks, dead-code-elimination, inline-isdirectbinding, inline-intptr-size, blockliteral-setupblock, register-protocols.");
 				rv.Messages.AssertErrorCount (0);
 			});
 		}
diff --git a/tests/mtouch/MTouch.cs b/tests/mtouch/MTouch.cs
index c9215832dd..68ecf18295 100644
--- a/tests/mtouch/MTouch.cs
+++ b/tests/mtouch/MTouch.cs
@@ -1646,13 +1646,14 @@ public class TestApp {
 		[Test]
 		[TestCase ("all")]
 		[TestCase ("-all")]
-		[TestCase ("remove-uithread-checks,dead-code-elimination,inline-isdirectbinding,inline-intptr-size,inline-runtime-arch")]
+		[TestCase ("remove-uithread-checks,dead-code-elimination,inline-isdirectbinding,inline-intptr-size,inline-runtime-arch,register-protocols")]
 		public void Optimizations (string opt)
 		{
 			using (var mtouch = new MTouchTool ()) {
 				mtouch.CreateTemporaryApp ();
 				mtouch.CreateTemporaryCacheDirectory ();
 				mtouch.Linker = MTouchLinker.LinkSdk;
+				mtouch.Registrar = MTouchRegistrar.Static;
 				mtouch.Optimize = new string [] { opt };
 				mtouch.AssertExecute (MTouchAction.BuildSim, "build");
 				mtouch.AssertNoWarnings ();