diff --git a/components/detournavigator/navigator.hpp b/components/detournavigator/navigator.hpp
index f2acc8c9d6..378af081d0 100644
--- a/components/detournavigator/navigator.hpp
+++ b/components/detournavigator/navigator.hpp
@@ -1,6 +1,7 @@
 #ifndef OPENMW_COMPONENTS_DETOURNAVIGATOR_NAVIGATOR_H
 #define OPENMW_COMPONENTS_DETOURNAVIGATOR_NAVIGATOR_H
 
+#include <cassert>
 #include <filesystem>
 
 #include "heightfieldshape.hpp"