diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index 570e23baa..13f563fd0 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -81,6 +81,8 @@ set(SLIC3R_GUI_SOURCES
     GUI/GUI_ObjectManipulation.hpp
     GUI/GUI_ObjectSettings.cpp
     GUI/GUI_ObjectSettings.hpp
+    GUI/GUI_ObjectLayers.cpp
+    GUI/GUI_ObjectLayers.hpp
     GUI/LambdaObjectDialog.cpp
     GUI/LambdaObjectDialog.hpp
     GUI/Tab.cpp