diff --git a/src/SourceGenerator.Foundations/Analyzer/Rules/RequireSfgGeneratorAttributeRule.cs b/src/SourceGenerator.Foundations/Analyzer/Rules/RequireSfgGeneratorAttributeRule.cs
index 7bf32e9..97a3ca1 100644
--- a/src/SourceGenerator.Foundations/Analyzer/Rules/RequireSfgGeneratorAttributeRule.cs
+++ b/src/SourceGenerator.Foundations/Analyzer/Rules/RequireSfgGeneratorAttributeRule.cs
@@ -1,5 +1,6 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+using System.Linq;
 
 namespace SGF.Analyzer.Rules
 {