diff --git a/src/asio_ssl.cpp b/src/asio_ssl.cpp
index 85cc75f9d..f0033b3a4 100644
--- a/src/asio_ssl.cpp
+++ b/src/asio_ssl.cpp
@@ -1,3 +1,7 @@
 // builds all boost.asio SSL source as a separate compilation unit
-#include <boost/asio/ssl/impl/src.hpp>
+#include <boost/version.hpp>
+
+#if BOOST_VERSION >= 104610
+#include <boost/asio/ssl/impl/src.hpp>
+#endif