diff --git a/search/vertex_generator.hh b/search/vertex_generator.hh
index 58a3cb869..d0e0dacc9 100644
--- a/search/vertex_generator.hh
+++ b/search/vertex_generator.hh
@@ -8,7 +8,7 @@
 #include <boost/unordered_map.hpp>
 #include <boost/version.hpp>
 
-#if BOOST_VERSION < 104200
+#if BOOST_VERSION <= 104200
 #include "util/exception.hh"
 #endif