diff --git a/test/flat_tree_test.cpp b/test/flat_tree_test.cpp
index 6be6f3a..78feb75 100644
--- a/test/flat_tree_test.cpp
+++ b/test/flat_tree_test.cpp
@@ -96,7 +96,7 @@ template class flat_tree
 }  //dtl {
 }} //boost::container
 
-#if (__cplusplus > 201103L)
+#if (BOOST_CXX_VERSION >= 201103L)
 #include <vector>
 
 namespace boost{