diff --git a/src/syslog_backend.cpp b/src/syslog_backend.cpp
index 9ce19f4..b39838d 100644
--- a/src/syslog_backend.cpp
+++ b/src/syslog_backend.cpp
@@ -13,9 +13,10 @@
  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  */
 
+#include <boost/log/detail/config.hpp>
+
 #ifndef BOOST_LOG_WITHOUT_SYSLOG
 
-#include <boost/log/detail/config.hpp>
 #include <ctime>
 #include <algorithm>
 #include <stdexcept>