diff --git a/include/libtorrent/utp_stream.hpp b/include/libtorrent/utp_stream.hpp
index 14f317cc8..e248c4823 100644
--- a/include/libtorrent/utp_stream.hpp
+++ b/include/libtorrent/utp_stream.hpp
@@ -70,7 +70,8 @@ namespace libtorrent
 	void set_utp_stream_logging(bool enable);
 #endif
 
-	bool compare_less_wrap(boost::uint32_t lhs, boost::uint32_t rhs, boost::uint32_t mask);
+	TORRENT_EXTRA_EXPORT bool compare_less_wrap(boost::uint32_t lhs
+		, boost::uint32_t rhs, boost::uint32_t mask);
 
 	struct utp_socket_manager;
 
diff --git a/src/utp_stream.cpp b/src/utp_stream.cpp
index f706acbb9..d4361d536 100644
--- a/src/utp_stream.cpp
+++ b/src/utp_stream.cpp
@@ -159,7 +159,8 @@ enum
 // into account. if lhs is close to UINT_MAX and rhs
 // is close to 0, lhs is assumed to have wrapped and
 // considered smaller
-TORRENT_EXTRA_EXPORT bool compare_less_wrap(boost::uint32_t lhs, boost::uint32_t rhs, boost::uint32_t mask)
+TORRENT_EXTRA_EXPORT bool compare_less_wrap(boost::uint32_t lhs
+	, boost::uint32_t rhs, boost::uint32_t mask)
 {
 	// distance walking from lhs to rhs, downwards
 	boost::uint32_t dist_down = (lhs - rhs) & mask;