diff --git a/build/Jamfile.v2 b/build/Jamfile.v2
index de9f389..58f3857 100644
--- a/build/Jamfile.v2
+++ b/build/Jamfile.v2
@@ -9,6 +9,9 @@
 
 project boost/system
     : source-location ../src
+    : usage-requirements
+      <link>shared:<define>BOOST_SYSTEM_DYN_LINK=1
+      <link>static:<define>BOOST_SYSTEM_STATIC_LINK=1
     ;
 
 SOURCES = error_code ;