diff --git a/src/Shared/RoslynUtils/WellKnownTypes.cs b/src/Shared/RoslynUtils/WellKnownTypes.cs
index 71ed75a2e5e5..05925ddf68bc 100644
--- a/src/Shared/RoslynUtils/WellKnownTypes.cs
+++ b/src/Shared/RoslynUtils/WellKnownTypes.cs
@@ -19,7 +19,6 @@ public static WellKnownTypes GetOrCreate(Compilation compilation) =>
 
     private readonly INamedTypeSymbol?[] _lazyWellKnownTypes;
     private readonly Compilation _compilation;
-    private readonly INamedTypeSymbol _missingTypeSymbol;
 
     static WellKnownTypes()
     {
@@ -52,7 +51,6 @@ private WellKnownTypes(Compilation compilation)
     {
         _lazyWellKnownTypes = new INamedTypeSymbol?[WellKnownTypeData.WellKnownTypeNames.Length];
         _compilation = compilation;
-        _missingTypeSymbol = compilation.GetTypeByMetadataName(typeof(MissingType).FullName!)!;
     }
 
     public INamedTypeSymbol Get(SpecialType type)