diff --git a/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/CacheTagHelperTest.cs b/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
index 62b07ed9a9..fe9915790f 100644
--- a/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.TagHelpers.Test/CacheTagHelperTest.cs
@@ -916,6 +916,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
             public DateTimeOffset? AbsoluteExpiration { get; set; }
             public TimeSpan? AbsoluteExpirationRelativeToNow { get; set; }
             public TimeSpan? SlidingExpiration { get; set; }
+            public long? Size { get; set; }
 
             public IList<IChangeToken> ExpirationTokens { get; } = new List<IChangeToken>();