1 files changed, 1 insertions, 1 deletions

diff --git a/src/wixext/VSExtensionFactory.cs b/src/wixext/VSExtensionFactory.cs
index cc0d7314..c6e0cc31 100644
--- a/src/wixext/VSExtensionFactory.cs
+++ b/src/wixext/VSExtensionFactory.cs
@@ -8,7 +8,7 @@ namespace WixToolset.VisualStudio
 
     public class VSExtensionFactory : BaseExtensionFactory
     {
-        protected override IEnumerable<Type> ExtensionTypes => new[]
+        protected override IReadOnlyCollection<Type> ExtensionTypes => new[]
         {
             typeof(VSCompiler),
             typeof(VSExtensionData),