diff --git a/src/Humanizer.Tests.Shared/Localisation/en/TimeToClockNotationTests.cs b/src/Humanizer.Tests.Shared/Localisation/en/TimeToClockNotationTests.cs
index 3b424939f..da99f6288 100644
--- a/src/Humanizer.Tests.Shared/Localisation/en/TimeToClockNotationTests.cs
+++ b/src/Humanizer.Tests.Shared/Localisation/en/TimeToClockNotationTests.cs
@@ -7,7 +7,7 @@ namespace Humanizer.Tests.Localisation.en
 {
     public class TimeToClockNotationTests
     {
-        [UseCulture("en-US")]
+        [UseCulture("en")]
         [Theory]
         [InlineData(00, 00, "midnight")]
         [InlineData(04, 00, "four o'clock")]
diff --git a/src/Humanizer/Configuration/TimeOnlyToClockNotationConvertersRegistry.cs b/src/Humanizer/Configuration/TimeOnlyToClockNotationConvertersRegistry.cs
index aff3004b2..07d435e29 100644
--- a/src/Humanizer/Configuration/TimeOnlyToClockNotationConvertersRegistry.cs
+++ b/src/Humanizer/Configuration/TimeOnlyToClockNotationConvertersRegistry.cs
@@ -8,8 +8,6 @@ internal class TimeOnlyToClockNotationConvertersRegistry : LocaliserRegistry<ITi
     {
         public TimeOnlyToClockNotationConvertersRegistry() : base(new DefaultTimeOnlyToClockNotationConverter())
         {
-            Register("en-US", new DefaultTimeOnlyToClockNotationConverter());
-            Register("en-UK", new DefaultTimeOnlyToClockNotationConverter());
             Register("pt-BR", new BrazilianPortugueseTimeOnlyToClockNotationConverter());
         }
     }