diff --git a/src/Features/Core/Portable/Diagnostics/Analyzers/SimplifyTypeNamesDiagnosticAnalyzerBase.cs b/src/Features/Core/Portable/Diagnostics/Analyzers/SimplifyTypeNamesDiagnosticAnalyzerBase.cs
index cda34277c5b9f..d2c93404d8418 100644
--- a/src/Features/Core/Portable/Diagnostics/Analyzers/SimplifyTypeNamesDiagnosticAnalyzerBase.cs
+++ b/src/Features/Core/Portable/Diagnostics/Analyzers/SimplifyTypeNamesDiagnosticAnalyzerBase.cs
@@ -88,6 +88,8 @@ public bool OpenFileOnly(Workspace workspace)
         public sealed override void Initialize(AnalysisContext context)
         {
             context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+            context.EnableConcurrentExecution();
+
             context.RegisterSyntaxNodeAction(AnalyzeNode, _kindsOfInterest);
         }