diff --git a/libs/geom/include/psemek/geom/interval.hpp b/libs/geom/include/psemek/geom/interval.hpp
index adf11a98..bfc3c328 100644
--- a/libs/geom/include/psemek/geom/interval.hpp
+++ b/libs/geom/include/psemek/geom/interval.hpp
@@ -115,6 +115,9 @@ namespace psemek::geom
 		interval & operator |= (interval const & i);
 	};
 
+	template <typename T>
+	interval(T, T) -> interval<T>;
+
 	template <typename T1, typename T>
 	interval<T1> cast(interval<T> const & i)
 	{