--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,7 +196,6 @@ set_option(USE_PICOSAT ON)
 #       btorconfig.h and they are else not yet added to CMAKE_C(XX)_FLAGS at
 #       file generation time (configure_file).
 add_required_c_flag("-std=gnu99")
-add_required_cxx_flag("-std=gnu++11")
 
 add_check_c_cxx_flag("-W")
 add_check_c_cxx_flag("-Wall")