2 files changed, 3 insertions, 3 deletions
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
index f21be7d9..4aecc998 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
@@ -96,7 +96,7 @@ namespace Google.Protobuf.WellKnownTypes
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message);
             var text = any.ToString();
-            Assert.That(text, Is.StringContaining("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
+            Assert.That(text, Does.Contain("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
         }
 
         [Test]
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
index 89bc8275..1d9908b4 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
@@ -46,8 +46,8 @@ namespace Google.Protobuf.WellKnownTypes
             var mask = new FieldMask { Paths = { input } };
             var text = mask.ToString();
             // More specific test below
-            Assert.That(text, Is.StringContaining("@warning"));
-            Assert.That(text, Is.StringContaining(input));
+            Assert.That(text, Does.Contain("@warning"));
+            Assert.That(text, Does.Contain(input));
         }
 
         [Test]