diff --git a/src/Analyzers/CSharp/CodeFixes/UseConditionalExpression/CSharpUseConditionalExpressionForAssignmentCodeFixProvider.cs b/src/Analyzers/CSharp/CodeFixes/UseConditionalExpression/CSharpUseConditionalExpressionForAssignmentCodeFixProvider.cs
index a894c26ed3cc6..39bcf0dc146c5 100644
--- a/src/Analyzers/CSharp/CodeFixes/UseConditionalExpression/CSharpUseConditionalExpressionForAssignmentCodeFixProvider.cs
+++ b/src/Analyzers/CSharp/CodeFixes/UseConditionalExpression/CSharpUseConditionalExpressionForAssignmentCodeFixProvider.cs
@@ -2,16 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#nullable disable
-
+using System;
 using System.Composition;
-using System.Diagnostics.CodeAnalysis;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CSharp.Formatting;
 using Microsoft.CodeAnalysis.CSharp.LanguageService;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Formatting;
 using Microsoft.CodeAnalysis.Formatting.Rules;
+using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.CodeAnalysis.LanguageService;
 using Microsoft.CodeAnalysis.Operations;
 using Microsoft.CodeAnalysis.Simplification;
@@ -20,16 +19,12 @@
 namespace Microsoft.CodeAnalysis.CSharp.UseConditionalExpression;
 
 [ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseConditionalExpressionForAssignment), Shared]
-internal partial class CSharpUseConditionalExpressionForAssignmentCodeFixProvider
+[method: ImportingConstructor]
+[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
+internal sealed class CSharpUseConditionalExpressionForAssignmentCodeFixProvider()
     : AbstractUseConditionalExpressionForAssignmentCodeFixProvider<
         StatementSyntax, IfStatementSyntax, LocalDeclarationStatementSyntax, VariableDeclaratorSyntax, ExpressionSyntax, ConditionalExpressionSyntax>
 {
-    [ImportingConstructor]
-    [SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
-    public CSharpUseConditionalExpressionForAssignmentCodeFixProvider()
-    {
-    }
-
     protected override ISyntaxFacts SyntaxFacts
         => CSharpSyntaxFacts.Instance;