diff --git a/build.jam b/build.jam
index f3847b9..d92b5ae 100644
--- a/build.jam
+++ b/build.jam
@@ -3,6 +3,8 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+require-b2 5.2 ;
+
 #|
 This B2 project provides support for using the Predef library externally as
 a standalone project. To use externally you would need a `use-project`
diff --git a/test/build.jam b/test/build.jam
index d67d932..eb23b2e 100644
--- a/test/build.jam
+++ b/test/build.jam
@@ -3,6 +3,7 @@
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+import-search ../tools/check ;
 import predef : require check : predef-require predef-check ;
 import common ;
 import path ;