diff --git a/include/libtorrent/escape_string.hpp b/include/libtorrent/escape_string.hpp
index 5be3dbe4a..feb7ccbfe 100644
--- a/include/libtorrent/escape_string.hpp
+++ b/include/libtorrent/escape_string.hpp
@@ -44,7 +44,7 @@ namespace libtorrent
 {
 	TORRENT_EXTRA_EXPORT boost::array<char, 3 + std::numeric_limits<size_type>::digits10> to_string(size_type n);
 	TORRENT_EXTRA_EXPORT bool is_alpha(char c);
-	TORRENT_EXTRA_EXPORT bool is_digit(char c);
+	TORRENT_EXPORT bool is_digit(char c);
 	TORRENT_EXTRA_EXPORT bool is_print(char c);
 	TORRENT_EXTRA_EXPORT bool is_space(char c);
 	TORRENT_EXTRA_EXPORT char to_lower(char c);