1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Extensibility/ILibrarianExtension.cs b/src/WixToolset.Extensibility/ILibrarianExtension.cs
index b9f707e1..719ffa34 100644
--- a/src/WixToolset.Extensibility/ILibrarianExtension.cs
+++ b/src/WixToolset.Extensibility/ILibrarianExtension.cs
@@ -9,7 +9,7 @@ namespace WixToolset.Extensibility
     {
         void PreCombine(ILibraryContext context);
 
-        ResolveFileResult ResolveFile(SourceLineNumber sourceLineNumber, IntermediateTupleDefinition tupleDefinition, string path);
+        IResolveFileResult ResolveFile(SourceLineNumber sourceLineNumber, IntermediateTupleDefinition tupleDefinition, string path);
 
         void PostCombine(Intermediate library);
     }