diff --git a/Lombiq.Tests.UI/Extensions/ShortcutsUITestContextExtensions.cs b/Lombiq.Tests.UI/Extensions/ShortcutsUITestContextExtensions.cs
index 957018451..cddfc3577 100644
--- a/Lombiq.Tests.UI/Extensions/ShortcutsUITestContextExtensions.cs
+++ b/Lombiq.Tests.UI/Extensions/ShortcutsUITestContextExtensions.cs
@@ -42,7 +42,6 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
-using System.Net.Http;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
diff --git a/Lombiq.Tests.UI/Helpers/HttpClientHelper.cs b/Lombiq.Tests.UI/Helpers/HttpClientHelper.cs
index 27cb1ecaf..8ae9da985 100644
--- a/Lombiq.Tests.UI/Helpers/HttpClientHelper.cs
+++ b/Lombiq.Tests.UI/Helpers/HttpClientHelper.cs
@@ -1,3 +1,5 @@
+#nullable enable
+
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Net.Http;
@@ -10,7 +12,6 @@ public static class HttpClientHelper
     public static HttpClient CreateCertificateIgnoringHttpClient(Uri? baseUri = null) =>
         new(CreateCertificateIgnoringHttpClientHandler()) { BaseAddress = baseUri };
 
-
     /// <summary>
     /// Creates a normally dangerous HTTP client handler that accepts any certificate, to allow working with self-signed
     /// development certificates.