diff --git a/src/EditorFeatures/Core.Wpf/InlineParamNameHints/InlineParamNameHintsTagger.cs b/src/EditorFeatures/Core.Wpf/InlineParamNameHints/InlineParamNameHintsTagger.cs
index 653f13edafae04d4d708fd11483f8415f2697620..2df19fd197eada811e2f4632817da5a76cae74b6 100644
--- a/src/EditorFeatures/Core.Wpf/InlineParamNameHints/InlineParamNameHintsTagger.cs
+++ b/src/EditorFeatures/Core.Wpf/InlineParamNameHints/InlineParamNameHintsTagger.cs
@@ -17,7 +17,7 @@ namespace Microsoft.CodeAnalysis.Editor.InlineParameterNameHints
     /// the <see cref="InlineParamNameHintsTag"/>, which actually creates the UIElement. It reacts to
     /// tags changing and updates the adornments accordingly.
     /// </summary>
-    class InlineParamNameHintsTagger : ITagger<IntraTextAdornmentTag>, IDisposable
+    internal sealed class InlineParamNameHintsTagger : ITagger<IntraTextAdornmentTag>, IDisposable
     {
         private readonly ITagAggregator<InlineParamNameHintDataTag> _tagAggregator;
         private readonly ITextBuffer _buffer;