diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index d9ad26a6ee..21d8fd6c85 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -348,7 +348,6 @@ set(SLIC3R_GUI_SOURCES
     GUI/Mouse3DController.hpp
     GUI/IMSlider.cpp
     GUI/IMSlider.hpp
-    GUI/IMSlider_Utils.hpp
     GUI/Notebook.cpp
     GUI/Notebook.hpp
     GUI/TabButton.cpp
diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index fc10e765e3..3c76e7d9d8 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -2,7 +2,6 @@
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Layer.hpp"
 #include "IMSlider.hpp"
-#include "IMSlider_Utils.hpp"
 #include "GUI_Preview.hpp"
 #include "GUI_App.hpp"
 #include "GUI.hpp"
diff --git a/src/slic3r/GUI/IMSlider_Utils.hpp b/src/slic3r/GUI/IMSlider_Utils.hpp
deleted file mode 100644
index e69de29bb2..0000000000