diff --git a/include/boost/beast/core/detail/config.hpp b/include/boost/beast/core/detail/config.hpp
index e182f919..8ec1c761 100644
--- a/include/boost/beast/core/detail/config.hpp
+++ b/include/boost/beast/core/detail/config.hpp
@@ -104,7 +104,7 @@ namespace net = boost::asio;
 
 
 #ifdef BOOST_BEAST_NO_SOURCE_LOCATION
-#define BOOST_BEAST_ASSIGN_EC(ec, error) ec.assign(error)
+#define BOOST_BEAST_ASSIGN_EC(ec, error) ec = error
 #else
 
 #define BOOST_BEAST_ASSIGN_EC(ec, error) \