diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index 03e0abe28..4d3055f2c 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -58,8 +58,9 @@ struct cmListFileArgument
   long Line;
 };
 
-struct cmListFileContext
+class cmListFileContext
 {
+public:
   std::string Name;
   std::string FilePath;
   long Line;