diff --git a/adobe/once.hpp b/adobe/once.hpp
index 5f005a4..e349b92 100644
--- a/adobe/once.hpp
+++ b/adobe/once.hpp
@@ -11,12 +11,12 @@
 
 /*************************************************************************************************/
 
-#include <adobe/config.hpp>
-
 #if defined(BOOST_HAS_THREADS)
     #include <boost/thread.hpp>
 #endif
 
+#include <adobe/config.hpp>
+
 /*************************************************************************************************/
 
 namespace adobe {