diff --git a/cmake/BornAgain/MacOS.cmake b/cmake/BornAgain/MacOS.cmake
index 9f84cc74414cf32977eb7bb6212ac4e48bb40667..e6355cc18ca70da69fda8668e1a45870f4fafbb4 100644
--- a/cmake/BornAgain/MacOS.cmake
+++ b/cmake/BornAgain/MacOS.cmake
@@ -40,6 +40,8 @@ string(APPEND CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS " -m64 ${DEADSTRIP_LFLAGS}")
 string(APPEND CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS " -m64 ${DEADSTRIP_LFLAGS}")
 string(APPEND CMAKE_CXX_FLAGS " -m64 -I${CMAKE_SOURCE_DIR}/Wrap")
 string(APPEND CMAKE_C_FLAGS " -m64")
+add_compile_options("-Wno-deprecated-declarations;-Wno-unused-parameter;-Wno-deprecated-copy") # TODO remove after r21
+
 # string(APPEND CMAKE_C_LINK_FLAGS " -bind_at_load -m64")
 # string(APPEND CMAKE_CXX_LINK_FLAGS " -bind_at_load -m64")