diff --git a/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.cs b/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.cs
index 2d6102c323fc99360433355ca6ae0cad3392dee7..6d7bd7dd3e850a470d7431ca852a767dc628763a 100644
--- a/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.cs
+++ b/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.cs
@@ -35,7 +35,7 @@ namespace Microsoft.CodeAnalysis.CSharp.UseIndexOrRangeOperator
     /// preserve semantics.
     /// </summary>
     [DiagnosticAnalyzer(LanguageNames.CSharp), Shared]
-    internal partial class CSharpUseIndexOperatorDiagnosticAnalyzer : AbstractCodeStyleDiagnosticAnalyzer
+    internal partial class CSharpUseIndexOperatorDiagnosticAnalyzer : AbstractBuiltInCodeStyleDiagnosticAnalyzer
     {
         public CSharpUseIndexOperatorDiagnosticAnalyzer() 
             : base(IDEDiagnosticIds.UseIndexOperatorDiagnosticId,
diff --git a/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseRangeOperatorDiagnosticAnalyzer.cs b/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseRangeOperatorDiagnosticAnalyzer.cs
index 5fb4e2b17efa2c8cb4ba755f00d427bb36e2253c..8f0424be08a1b0803ef1eb2164da5348da113bf9 100644
--- a/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseRangeOperatorDiagnosticAnalyzer.cs
+++ b/src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseRangeOperatorDiagnosticAnalyzer.cs
@@ -27,7 +27,7 @@ namespace Microsoft.CodeAnalysis.CSharp.UseIndexOrRangeOperator
     /// could always limit the feature to only work on a whitelist of known safe types.
     /// </summary>
     [DiagnosticAnalyzer(LanguageNames.CSharp), Shared]
-    internal partial class CSharpUseRangeOperatorDiagnosticAnalyzer : AbstractCodeStyleDiagnosticAnalyzer
+    internal partial class CSharpUseRangeOperatorDiagnosticAnalyzer : AbstractBuiltInCodeStyleDiagnosticAnalyzer
     {
         public const string UseIndexer = nameof(UseIndexer);
         public const string ComputedRange = nameof(ComputedRange);