diff --git a/CMakeLists.txt b/CMakeLists.txt
index b9addcf005b..27d2c761f4e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -797,10 +797,8 @@ if(NOT MSVC)
   # Details at http://eigen.tuxfamily.org/bz/show_bug.cgi?id=1459
   string(APPEND CMAKE_CXX_FLAGS " -Wall")
   string(APPEND CMAKE_CXX_FLAGS " -Wextra")
-  append_cxx_flag_if_supported("-Werror=return-type" CMAKE_CXX_FLAGS)
   append_cxx_flag_if_supported("-Werror=non-virtual-dtor" CMAKE_CXX_FLAGS)
   append_cxx_flag_if_supported("-Werror=braced-scalar-init" CMAKE_CXX_FLAGS)
-  append_cxx_flag_if_supported("-Werror=range-loop-construct" CMAKE_CXX_FLAGS)
   append_cxx_flag_if_supported("-Werror=bool-operation" CMAKE_CXX_FLAGS)
   append_cxx_flag_if_supported("-Wnarrowing" CMAKE_CXX_FLAGS)
   append_cxx_flag_if_supported("-Wno-missing-field-initializers" CMAKE_CXX_FLAGS)