1 files changed, 1 insertions, 1 deletions

diff --git a/src/wixext/IisWindowsInstallerBackendBinderExtension.cs b/src/wixext/IisWindowsInstallerBackendBinderExtension.cs
index 29d34a09..a61cbad6 100644
--- a/src/wixext/IisWindowsInstallerBackendBinderExtension.cs
+++ b/src/wixext/IisWindowsInstallerBackendBinderExtension.cs
@@ -8,6 +8,6 @@ namespace WixToolset.Iis
 
     public class IisWindowsInstallerBackendBinderExtension : BaseWindowsInstallerBackendBinderExtension
     {
-        public override IEnumerable<TableDefinition> TableDefinitions => IisTableDefinitions.All;
+        public override IReadOnlyCollection<TableDefinition> TableDefinitions => IisTableDefinitions.All;
     }
 }