diff --git a/X10D.Tests/src/Core/EnumTests.cs b/X10D.Tests/src/Core/EnumTests.cs
index 8347470..8e7889d 100644
--- a/X10D.Tests/src/Core/EnumTests.cs
+++ b/X10D.Tests/src/Core/EnumTests.cs
@@ -1,4 +1,5 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using X10D.Core;
 
 namespace X10D.Tests.Core;
 
diff --git a/X10D/src/EnumExtensions/EnumExtensions.cs b/X10D/src/Core/EnumExtensions.cs
similarity index 99%
rename from X10D/src/EnumExtensions/EnumExtensions.cs
rename to X10D/src/Core/EnumExtensions.cs
index 55edd93..fe4259d 100644
--- a/X10D/src/EnumExtensions/EnumExtensions.cs
+++ b/X10D/src/Core/EnumExtensions.cs
@@ -1,4 +1,4 @@
-namespace X10D;
+namespace X10D.Core;
 
 /// <summary>
 ///     Extension methods for <see langword="enum" /> types.