1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Core/Bind/ResolveFieldsCommand.cs b/src/WixToolset.Core/Bind/ResolveFieldsCommand.cs
index 2738ac6c..794208e5 100644
--- a/src/WixToolset.Core/Bind/ResolveFieldsCommand.cs
+++ b/src/WixToolset.Core/Bind/ResolveFieldsCommand.cs
@@ -36,7 +36,7 @@ namespace WixToolset.Core.Bind
 
         public bool AllowUnresolvedVariables { private get; set; }
 
-        public IEnumerable<DelayedField> DelayedFields { get; private set; }
+        public IReadOnlyCollection<DelayedField> DelayedFields { get; private set; }
 
         public void Execute()
         {