diff --git a/libs/geom/include/psemek/geom/intersection.hpp b/libs/geom/include/psemek/geom/intersection.hpp
index 49d9dc94..5224e0a6 100644
--- a/libs/geom/include/psemek/geom/intersection.hpp
+++ b/libs/geom/include/psemek/geom/intersection.hpp
@@ -252,13 +252,13 @@ namespace psemek::geom
 	template <typename T, std::size_t N>
 	bool intersect(ray<T, N> const & r, sphere<T, N> const & s)
 	{
-		return intersection(r, s).empty();
+		return !intersection(r, s).empty();
 	}
 
 	template <typename T, std::size_t N>
 	bool intersect(ray<T, N> const & r, cylinder<T, N> const & c)
 	{
-		return intersection(r, c).empty();
+		return !intersection(r, c).empty();
 	}
 
 }