diff --git a/test/Microsoft.AspNetCore.Razor.Language.Test/Legacy/HtmlBlockTest.cs b/test/Microsoft.AspNetCore.Razor.Language.Test/Legacy/HtmlBlockTest.cs
index 5d3d46a831..3abd53b105 100644
--- a/test/Microsoft.AspNetCore.Razor.Language.Test/Legacy/HtmlBlockTest.cs
+++ b/test/Microsoft.AspNetCore.Razor.Language.Test/Legacy/HtmlBlockTest.cs
@@ -333,7 +333,13 @@ namespace Microsoft.AspNetCore.Razor.Language.Legacy
         [Fact]
         public void ParseBlockSupportsCommentAsBlock()
         {
-            ParseBlockTest("<!-- foo -->", new MarkupBlock( BlockFactory.HtmlCommentBlock(" foo ")));
+            ParseBlockTest("<!-- foo -->", new MarkupBlock(BlockFactory.HtmlCommentBlock(" foo ")));
+        }
+
+        [Fact]
+        public void ParseBlockSupportsCommentWithExtraDashAsBlock()
+        {
+            ParseBlockTest("<!-- foo --->", new MarkupBlock(BlockFactory.HtmlCommentBlock(" foo -")));
         }
 
         [Fact]