diff --git a/algorithm-exercises-csharp-test/src/hackerrank/warmup/SimpleArraySum.Test.cs b/algorithm-exercises-csharp-test/src/hackerrank/warmup/SimpleArraySum.Test.cs
index cd7d47d..1be3136 100644
--- a/algorithm-exercises-csharp-test/src/hackerrank/warmup/SimpleArraySum.Test.cs
+++ b/algorithm-exercises-csharp-test/src/hackerrank/warmup/SimpleArraySum.Test.cs
@@ -1,4 +1,4 @@
-namespace algorithm_exercises_csharp;
+namespace algorithm_exercises_csharp.hackerrank;
 
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
diff --git a/algorithm-exercises-csharp/src/hackerrank/warmup/SimpleArraySum.cs b/algorithm-exercises-csharp/src/hackerrank/warmup/SimpleArraySum.cs
index 15147ef..beb9223 100644
--- a/algorithm-exercises-csharp/src/hackerrank/warmup/SimpleArraySum.cs
+++ b/algorithm-exercises-csharp/src/hackerrank/warmup/SimpleArraySum.cs
@@ -1,6 +1,6 @@
 // @link Problem definition [[docs/hackerrank/warmup/simple_array_sum.md]]
 
-namespace algorithm_exercises_csharp;
+namespace algorithm_exercises_csharp.hackerrank;
 
 using System.Diagnostics.CodeAnalysis;