diff --git a/src/Exercism.TestRunner.CSharp/Options.cs b/src/Exercism.TestRunner.CSharp/Options.cs
index 5e490ea..6880da7 100644
--- a/src/Exercism.TestRunner.CSharp/Options.cs
+++ b/src/Exercism.TestRunner.CSharp/Options.cs
@@ -30,5 +30,6 @@ public Options(string slug, string inputDirectory, string outputDirectory) =>
 
     public string ResultsJsonFilePath => Path.GetFullPath(Path.Combine(OutputDirectory, "results.json"));
 
-    private string Exercise => Slug.Dehumanize().Pascalize();
+    // Work around a regression bug: https://github.com/Humanizr/Humanizer/issues/1668
+    private string Exercise => Slug.Pascalize().Replace("-", "");
 }
\ No newline at end of file
diff --git a/tests/dotnet-nine/DotnetNine.cs b/tests/dotnet9/Dotnet9.cs
similarity index 100%
rename from tests/dotnet-nine/DotnetNine.cs
rename to tests/dotnet9/Dotnet9.cs
diff --git a/tests/dotnet-nine/DotnetNine.csproj b/tests/dotnet9/Dotnet9.csproj
similarity index 100%
rename from tests/dotnet-nine/DotnetNine.csproj
rename to tests/dotnet9/Dotnet9.csproj
diff --git a/tests/dotnet-nine/DotnetNineTests.cs b/tests/dotnet9/Dotnet9Tests.cs
similarity index 100%
rename from tests/dotnet-nine/DotnetNineTests.cs
rename to tests/dotnet9/Dotnet9Tests.cs
diff --git a/tests/dotnet-nine/expected_results.json b/tests/dotnet9/expected_results.json
similarity index 100%
rename from tests/dotnet-nine/expected_results.json
rename to tests/dotnet9/expected_results.json