diff --git a/test/failed_constexpr_test.cpp b/test/failed_constexpr_test.cpp
index e9ccab5..1492e2c 100644
--- a/test/failed_constexpr_test.cpp
+++ b/test/failed_constexpr_test.cpp
@@ -35,16 +35,28 @@ BOOST_STATIC_ASSERT( !ec3 );
 
 constexpr error_condition en1( 1, system_category() );
 
+#if __GNUC__ == 7 && __cplusplus == 201703L
+// `cat_ != 0` is not a constant expression
+#else
+
 BOOST_STATIC_ASSERT( en1.failed() );
 BOOST_STATIC_ASSERT( en1 );
 BOOST_STATIC_ASSERT( !!en1 );
 
+#endif
+
 constexpr error_condition en2( 2, generic_category() );
 
+#if __GNUC__ == 7 && __cplusplus == 201703L
+// `cat_ != 0` is not a constant expression
+#else
+
 BOOST_STATIC_ASSERT( en2.failed() );
 BOOST_STATIC_ASSERT( en2 );
 BOOST_STATIC_ASSERT( !!en2 );
 
+#endif
+
 constexpr error_condition en3;
 
 BOOST_STATIC_ASSERT( !en3.failed() );