diff --git a/include/boost/preprocessor/debug/assert.hpp b/include/boost/preprocessor/debug/assert.hpp
index d0a77b9..94fdb9a 100644
--- a/include/boost/preprocessor/debug/assert.hpp
+++ b/include/boost/preprocessor/debug/assert.hpp
@@ -23,7 +23,7 @@
 #
 # /* BOOST_PP_ASSERT */
 #
-# if ~BOOST_PP_CONFIG_FLAGS & BOOST_PP_CONFIG_EDG
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
 #    define BOOST_PP_ASSERT BOOST_PP_ASSERT_D
 # else
 #    define BOOST_PP_ASSERT(cond) BOOST_PP_ASSERT_D(cond)
@@ -34,7 +34,7 @@
 #
 # /* BOOST_PP_ASSERT_MSG */
 #
-# if ~BOOST_PP_CONFIG_FLAGS & BOOST_PP_CONFIG_EDG
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
 #    define BOOST_PP_ASSERT_MSG BOOST_PP_ASSERT_MSG_D
 # else
 #    define BOOST_PP_ASSERT_MSG(cond, msg) BOOST_PP_ASSERT_MSG_D(cond, msg)