1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Core/CommandLine/CompileCommand.cs b/src/WixToolset.Core/CommandLine/CompileCommand.cs
index 54d1b6f1..6e31b241 100644
--- a/src/WixToolset.Core/CommandLine/CompileCommand.cs
+++ b/src/WixToolset.Core/CommandLine/CompileCommand.cs
@@ -42,7 +42,7 @@ namespace WixToolset.Core.CommandLine
 
         private Platform Platform { get; }
 
-        public IEnumerable<string> IncludeSearchPaths { get; }
+        public IReadOnlyCollection<string> IncludeSearchPaths { get; }
 
         public bool ShowLogo => throw new NotImplementedException();