diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c6a41b..ff973e8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/adm/cmake")
 
 set (CMAKE_SUPPRESS_REGENERATION TRUE)
 
-set (CMAKE_CONFIGURATION_TYPES Release Debug RelWithDebInfo CACHE INTERNAL "" FORCE)
+set (CMAKE_CONFIGURATION_TYPES Release Debug RelWithDebInfo None CACHE INTERNAL "" FORCE)
 
 # macro: include patched file if it exists
 macro (OCCT_INCLUDE_CMAKE_FILE BEING_INCLUDED_FILE)