diff --git a/CMakeLists.txt b/CMakeLists.txt
index 25a078d3..298c9af5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -112,15 +112,10 @@ set(HEADERS
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/render/detail/Vertex.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/video/Keyframe.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/video/keyframe_merging.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/optional.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/optional_serialization.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/detail/akrzemi1_optional.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/detail/akrzemi1_optional_serialization.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/variant.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/variant_serialization.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/detail/mpark_variant.hpp
   ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/detail/mpark_variant_serialization.hpp
-  ${CMAKE_CURRENT_SOURCE_DIR}/include/eos/cpp17/clamp.hpp
 )
 
 add_library(eos INTERFACE)