1 files changed, 4 insertions, 4 deletions

diff --git a/src/WixToolset.Core/LibraryContext.cs b/src/WixToolset.Core/LibraryContext.cs
index 62d4e70c..e701cadf 100644
--- a/src/WixToolset.Core/LibraryContext.cs
+++ b/src/WixToolset.Core/LibraryContext.cs
@@ -23,15 +23,15 @@ namespace WixToolset.Core
 
         public bool BindFiles { get; set; }
 
-        public IEnumerable<IBindPath> BindPaths { get; set; }
+        public IReadOnlyCollection<IBindPath> BindPaths { get; set; }
 
-        public IEnumerable<ILibrarianExtension> Extensions { get; set; }
+        public IReadOnlyCollection<ILibrarianExtension> Extensions { get; set; }
 
         public string LibraryId { get; set; }
 
-        public IEnumerable<Localization> Localizations { get; set; }
+        public IReadOnlyCollection<Localization> Localizations { get; set; }
 
-        public IEnumerable<Intermediate> Intermediates { get; set; }
+        public IReadOnlyCollection<Intermediate> Intermediates { get; set; }
 
         public CancellationToken CancellationToken { get; set; }
     }