diff --git a/test/iterator_traits_test.cpp b/test/iterator_traits_test.cpp
index 6cdb2c6..40da049 100644
--- a/test/iterator_traits_test.cpp
+++ b/test/iterator_traits_test.cpp
@@ -157,7 +157,7 @@ input_iterator_test<std::istream_iterator<int>, int, std::ptrdiff_t, int*, int&,
 // Note: gcc 10.1 defines __cplusplus to a value less than 202002L, but greater than 201703L in C++20 mode.
 #if (__cplusplus > 201703L && ( \
         (defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION >= 100100) || \
-        (defined(_LIBCPP_VERSION) && _LIBCPP_VERSION >= 12000)
+        (defined(_LIBCPP_VERSION) && _LIBCPP_VERSION >= 12000) \
     )) || \
     (defined(_MSVC_LANG) && _MSVC_LANG > 201703L && _MSVC_STL_UPDATE >= 202010L)
 #define BOOST_ITERATOR_CXX20_OSTREAM_ITERATOR