1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Core/Resolver.cs b/src/WixToolset.Core/Resolver.cs
index f4cb2fd6..e93f8e1b 100644
--- a/src/WixToolset.Core/Resolver.cs
+++ b/src/WixToolset.Core/Resolver.cs
@@ -77,7 +77,7 @@ namespace WixToolset.Core
 
             var filesWithEmbeddedFiles = new ExtractEmbeddedFiles();
 
-            IEnumerable<DelayedField> delayedFields;
+            IReadOnlyCollection<DelayedField> delayedFields;
             {
                 var command = new ResolveFieldsCommand();
                 command.Messaging = this.Messaging;