diff --git a/include/libtorrent/config.hpp b/include/libtorrent/config.hpp
index 9c3797695..3a115c5fe 100644
--- a/include/libtorrent/config.hpp
+++ b/include/libtorrent/config.hpp
@@ -315,7 +315,7 @@ inline int snprintf(char* buf, int len, char const* fmt, ...)
 #define for if (false) {} else for
 #endif
 
-#if TORRENT_STRICT_UNIONS
+#if TORRENT_BROKEN_UNIONS
 #define TORRENT_UNION struct
 #else
 #define TORRENT_UNION union