diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SimpleProgramNamedTypeSymbol.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SimpleProgramNamedTypeSymbol.cs
index 55ba76991dbcc..726d41048197d 100644
--- a/src/Compilers/CSharp/Portable/Symbols/Source/SimpleProgramNamedTypeSymbol.cs
+++ b/src/Compilers/CSharp/Portable/Symbols/Source/SimpleProgramNamedTypeSymbol.cs
@@ -220,7 +220,7 @@ protected override MembersAndInitializers BuildMembersAndInitializers(Diagnostic
                                               instanceInitializersSyntaxLength: 0);
         }
 
-        public override bool IsImplicitlyDeclared => false;
+        public override bool IsImplicitlyDeclared => true;
 
         internal override bool IsDefinedInSourceTree(SyntaxTree tree, TextSpan? definedWithinSpan, CancellationToken cancellationToken)
         {