diff --git a/mapproxy/src/mapproxy/CMakeLists.txt b/mapproxy/src/mapproxy/CMakeLists.txt
index 66e1440..e6c2c46 100644
--- a/mapproxy/src/mapproxy/CMakeLists.txt
+++ b/mapproxy/src/mapproxy/CMakeLists.txt
@@ -131,8 +131,7 @@ set(mapproxy_SOURCES
   generator.hpp
   generator/generator.cpp
   generator/generators.hpp generator/generators.cpp
-  generator/registry.hpp generator/registry.cpp
-  generator/factory.hpp
+  generator/factory.hpp generator/registry.cpp
   generator/metatile.hpp generator/metatile.cpp
   generator/demregistry.hpp generator/demregistry.cpp
   generator/providers.hpp