--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -184,6 +184,7 @@ if(NOT MSVC)
   ei_add_cxx_compiler_flag("-wd2304")                   # disable ICC's "warning #2304: non-explicit constructor with single argument may cause implicit type conversion" produced by -Wnon-virtual-dtor
 
 
+  if(NOT EIGEN_TEST_CXX11)
   # The -ansi flag must be added last, otherwise it is also used as a linker flag by check_cxx_compiler_flag making it fails
   # Moreover we should not set both -strict-ansi and -ansi
   check_cxx_compiler_flag("-strict-ansi" COMPILER_SUPPORT_STRICTANSI)
@@ -194,6 +195,7 @@ if(NOT MSVC)
   else()
     ei_add_cxx_compiler_flag("-ansi")
   endif()
+  endif()
 
   if(ANDROID_NDK)
     ei_add_cxx_compiler_flag("-pie")