diff --git a/build.jam b/build.jam
index 76439ae..1c4a682 100644
--- a/build.jam
+++ b/build.jam
@@ -7,9 +7,9 @@ import project ;
 
 project /boost/typeof
     : common-requirements
-        <source>/boost/config//boost_config
-        <source>/boost/preprocessor//boost_preprocessor
-        <source>/boost/type_traits//boost_type_traits
+        <library>/boost/config//boost_config
+        <library>/boost/preprocessor//boost_preprocessor
+        <library>/boost/type_traits//boost_type_traits
         <include>include
     ;