diff --git a/include/engine/map_matching/matching_confidence.hpp b/include/engine/map_matching/matching_confidence.hpp
index 4b6b00a83..41d4a731d 100644
--- a/include/engine/map_matching/matching_confidence.hpp
+++ b/include/engine/map_matching/matching_confidence.hpp
@@ -2,7 +2,7 @@
 #define ENGINE_MAP_MATCHING_CONFIDENCE_HPP
 
 #include "engine/map_matching/bayes_classifier.hpp"
-
+#include <boost/assert.hpp>
 #include <cmath>
 
 namespace osrm::engine::map_matching