diff --git a/build.jam b/build.jam
index 82e26b0..8a91df9 100644
--- a/build.jam
+++ b/build.jam
@@ -7,11 +7,11 @@ import project ;
 
 project /boost/system
     : common-requirements
-        <source>/boost/assert//boost_assert
-        <source>/boost/config//boost_config
-        <source>/boost/throw_exception//boost_throw_exception
-        <source>/boost/variant2//boost_variant2
-        <source>/boost/winapi//boost_winapi
+        <library>/boost/assert//boost_assert
+        <library>/boost/config//boost_config
+        <library>/boost/throw_exception//boost_throw_exception
+        <library>/boost/variant2//boost_variant2
+        <library>/boost/winapi//boost_winapi
         <include>include
     ;