diff --git a/X10D/src/StringExtensions/StringExtensions.cs b/X10D/src/StringExtensions/StringExtensions.cs
index f8abe5c..f16a9b8 100644
--- a/X10D/src/StringExtensions/StringExtensions.cs
+++ b/X10D/src/StringExtensions/StringExtensions.cs
@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text;
+using X10D.Collections;
 
 namespace X10D;