diff --git a/xs/CMakeLists.txt b/xs/CMakeLists.txt
index fbddc31e6..f1f0c692b 100644
--- a/xs/CMakeLists.txt
+++ b/xs/CMakeLists.txt
@@ -74,8 +74,8 @@ add_library(libslic3r STATIC
     ${LIBDIR}/libslic3r/Fill/FillRectilinear3.hpp
     ${LIBDIR}/libslic3r/Flow.cpp
     ${LIBDIR}/libslic3r/Flow.hpp
-    ${LIBDIR}/libslic3r/Format/3MF.cpp
-    ${LIBDIR}/libslic3r/Format/3MF.hpp
+    ${LIBDIR}/libslic3r/Format/3mf.cpp
+    ${LIBDIR}/libslic3r/Format/3mf.hpp
     ${LIBDIR}/libslic3r/Format/AMF.cpp
     ${LIBDIR}/libslic3r/Format/AMF.hpp
     ${LIBDIR}/libslic3r/Format/OBJ.cpp