1 files changed, 2 insertions, 2 deletions

diff --git a/src/WixToolset.Data/WindowsInstaller/WindowsInstallerStandard.cs b/src/WixToolset.Data/WindowsInstaller/WindowsInstallerStandard.cs
index 0e6092b3..b6930b79 100644
--- a/src/WixToolset.Data/WindowsInstaller/WindowsInstallerStandard.cs
+++ b/src/WixToolset.Data/WindowsInstaller/WindowsInstallerStandard.cs
@@ -414,12 +414,12 @@ namespace WixToolset.Data.WindowsInstaller
         /// <summary>
         /// Standard actions.
         /// </summary>
-        public static IEnumerable<WixActionSymbol> StandardActions() => standardActionsById.Values;
+        public static IReadOnlyCollection<WixActionSymbol> StandardActions() => standardActionsById.Values;
 
         /// <summary>
         /// Standard directories.
         /// </summary>
-        public static IEnumerable<DirectorySymbol> StandardDirectories() => standardDirectoriesById.Values;
+        public static IReadOnlyCollection<DirectorySymbol> StandardDirectories() => standardDirectoriesById.Values;
 
         /// <summary>
         /// Gets the platform specific directory id for a directory. Most directories are not platform