diff --git a/src/Microsoft.AspNetCore.Razor.Language/TagHelperDescriptor.cs b/src/Microsoft.AspNetCore.Razor.Language/TagHelperDescriptor.cs
index 2f0e329dc8..4068305fa0 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/TagHelperDescriptor.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/TagHelperDescriptor.cs
@@ -22,13 +22,13 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public string Name { get; protected set; }
 
-        public IEnumerable<TagMatchingRuleDescriptor> TagMatchingRules { get; protected set; }
+        public IReadOnlyList<TagMatchingRuleDescriptor> TagMatchingRules { get; protected set; }
 
         public string AssemblyName { get; protected set; }
 
-        public IEnumerable<BoundAttributeDescriptor> BoundAttributes { get; protected set; }
+        public IReadOnlyList<BoundAttributeDescriptor> BoundAttributes { get; protected set; }
 
-        public IEnumerable<AllowedChildTagDescriptor> AllowedChildTags { get; protected set; }
+        public IReadOnlyList<AllowedChildTagDescriptor> AllowedChildTags { get; protected set; }
 
         public string Documentation { get; protected set; }
 
diff --git a/src/Microsoft.AspNetCore.Razor.Language/TagMatchingRuleDescriptor.cs b/src/Microsoft.AspNetCore.Razor.Language/TagMatchingRuleDescriptor.cs
index 847eb294f1..d4564b88e7 100644
--- a/src/Microsoft.AspNetCore.Razor.Language/TagMatchingRuleDescriptor.cs
+++ b/src/Microsoft.AspNetCore.Razor.Language/TagMatchingRuleDescriptor.cs
@@ -13,7 +13,7 @@ namespace Microsoft.AspNetCore.Razor.Language
 
         public string TagName { get; protected set; }
 
-        public IEnumerable<RequiredAttributeDescriptor> Attributes { get; protected set; }
+        public IReadOnlyList<RequiredAttributeDescriptor> Attributes { get; protected set; }
 
         public string ParentTag { get; protected set; }