diff --git a/libs/geom/include/psemek/geom/sphere.hpp b/libs/geom/include/psemek/geom/sphere.hpp
index 1410768b..2db301ea 100644
--- a/libs/geom/include/psemek/geom/sphere.hpp
+++ b/libs/geom/include/psemek/geom/sphere.hpp
@@ -12,4 +12,7 @@ namespace psemek::geom
 		T radius;
 	};
 
+	template <typename T, std::size_t N>
+	sphere(point<T, N>, T) -> sphere<T, N>;
+
 }