diff --git a/include/boost/preprocessor/config/config.hpp b/include/boost/preprocessor/config/config.hpp
index fcf2451..4f5a3ed 100644
--- a/include/boost/preprocessor/config/config.hpp
+++ b/include/boost/preprocessor/config/config.hpp
@@ -26,7 +26,7 @@
 # ifndef BOOST_PP_CONFIG_FLAGS
 #    if defined(__GCCXML__)
 #        define BOOST_PP_CONFIG_FLAGS() (BOOST_PP_CONFIG_STRICT())
-#    if defined(__SPIRIT_PP__) || defined(__MWERKS__) && __MWERKS__ >= 0x3200
+#    elif defined(__SPIRIT_PP__) || defined(__MWERKS__) && __MWERKS__ >= 0x3200
 #        define BOOST_PP_CONFIG_FLAGS() (BOOST_PP_CONFIG_STRICT())
 #    elif defined(__EDG__) || defined(__EDG_VERSION__)
 #        define BOOST_PP_CONFIG_FLAGS() (BOOST_PP_CONFIG_EDG() | BOOST_PP_CONFIG_STRICT())