diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index df3ddb6de..adbfb9de2 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -51,6 +51,8 @@ add_library(libslic3r STATIC
     Fill/FillRectilinear2.hpp
     Fill/FillRectilinear3.cpp
     Fill/FillRectilinear3.hpp
+    Fill/FillSmooth.cpp
+    Fill/FillSmooth.hpp
     Flow.cpp
     Flow.hpp
     Format/3mf.cpp
@@ -105,6 +107,8 @@ add_library(libslic3r STATIC
     "${CMAKE_CURRENT_BINARY_DIR}/libslic3r_version.h"
     Line.cpp
     Line.hpp
+    MedialAxis.cpp
+    MedialAxis.hpp
     Model.cpp
     Model.hpp
     ModelArrange.hpp
diff --git a/xs/src/libslic3r/Fill/FillSmooth.cpp b/src/libslic3r/Fill/FillSmooth.cpp
similarity index 100%
rename from xs/src/libslic3r/Fill/FillSmooth.cpp
rename to src/libslic3r/Fill/FillSmooth.cpp
diff --git a/xs/src/libslic3r/Fill/FillSmooth.hpp b/src/libslic3r/Fill/FillSmooth.hpp
similarity index 100%
rename from xs/src/libslic3r/Fill/FillSmooth.hpp
rename to src/libslic3r/Fill/FillSmooth.hpp
diff --git a/xs/src/libslic3r/MedialAxis.cpp b/src/libslic3r/MedialAxis.cpp
similarity index 100%
rename from xs/src/libslic3r/MedialAxis.cpp
rename to src/libslic3r/MedialAxis.cpp
diff --git a/xs/src/libslic3r/MedialAxis.hpp b/src/libslic3r/MedialAxis.hpp
similarity index 100%
rename from xs/src/libslic3r/MedialAxis.hpp
rename to src/libslic3r/MedialAxis.hpp