diff --git a/src/Exercism.TestRunner.CSharp/TestsRewriter.cs b/src/Exercism.TestRunner.CSharp/TestsRewriter.cs
index f46214e..b056827 100644
--- a/src/Exercism.TestRunner.CSharp/TestsRewriter.cs
+++ b/src/Exercism.TestRunner.CSharp/TestsRewriter.cs
@@ -96,7 +96,7 @@ public override SyntaxNode VisitConstructorDeclaration(ConstructorDeclarationSyn
                                                 Argument(
                                                     IdentifierName("_stringWriter"))))))));
 
-            public override SyntaxNode? VisitMethodDeclaration(MethodDeclarationSyntax node)
+            public override SyntaxNode VisitMethodDeclaration(MethodDeclarationSyntax node)
             {
                 if (node.Identifier.Text == "Dispose")
                     return base.VisitMethodDeclaration(