diff --git a/include/boost/geometry/strategies/cartesian/cart_intersect.hpp b/include/boost/geometry/strategies/cartesian/cart_intersect.hpp
index 540bc704c..ea92cf37b 100644
--- a/include/boost/geometry/strategies/cartesian/cart_intersect.hpp
+++ b/include/boost/geometry/strategies/cartesian/cart_intersect.hpp
@@ -193,7 +193,7 @@ struct relate_cartesian_segments
             }
             else
             {
-                r = da / d;
+                r = promoted_type(da) / promoted_type(d);
 
                 if (! robustness_verify_r(a, b, r))
                 {