diff --git a/src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime/SpecifyCultureForToLowerAndToUpper.cs b/src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime/SpecifyCultureForToLowerAndToUpper.cs
index 3134000e9a..4f46e65a35 100644
--- a/src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime/SpecifyCultureForToLowerAndToUpper.cs
+++ b/src/NetAnalyzers/Core/Microsoft.NetCore.Analyzers/Runtime/SpecifyCultureForToLowerAndToUpper.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
 
 using System.Collections.Immutable;
+using System.Linq;
 using Analyzer.Utilities;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
@@ -33,25 +34,24 @@ public abstract class SpecifyCultureForToLowerAndToUpperAnalyzer : AbstractGloba
 
         protected override void InitializeWorker(CompilationStartAnalysisContext context)
         {
+            var stringType = context.Compilation.GetSpecialType(SpecialType.System_String);
+            var toLower = stringType.GetMembers(ToLowerMethodName).FirstOrDefault(m => !m.IsStatic && m is IMethodSymbol method && method.Parameters.IsEmpty);
+            var toUpper = stringType.GetMembers(ToUpperMethodName).FirstOrDefault(m => !m.IsStatic && m is IMethodSymbol method && method.Parameters.IsEmpty);
+            if (toLower is null && toUpper is null)
+            {
+                return;
+            }
+
             context.RegisterOperationAction(operationContext =>
             {
                 var operation = (IInvocationOperation)operationContext.Operation;
                 IMethodSymbol methodSymbol = operation.TargetMethod;
 
-                if (methodSymbol.ContainingType.SpecialType == SpecialType.System_String &&
-                    !methodSymbol.IsStatic &&
-                    IsToLowerOrToUpper(methodSymbol.Name) &&
-                    //picking the correct overload
-                    methodSymbol.Parameters.Length == 0)
+                if (methodSymbol.Equals(toLower, SymbolEqualityComparer.Default) || methodSymbol.Equals(toUpper, SymbolEqualityComparer.Default))
                 {
                     operationContext.ReportDiagnostic(Diagnostic.Create(Rule, GetMethodNameLocation(operation.Syntax)));
                 }
             }, OperationKind.Invocation);
         }
-
-        private static bool IsToLowerOrToUpper(string methodName)
-        {
-            return methodName == ToLowerMethodName || methodName == ToUpperMethodName;
-        }
     }
 }