diff --git a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Do_intersect_3.h b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Do_intersect_3.h
index 3e1e5bf83d1..18b3ebf66e7 100644
--- a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Do_intersect_3.h
+++ b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Do_intersect_3.h
@@ -790,7 +790,7 @@ public:
 
         eps = 1.99986535548615598560e-15 * (std::max)((std::max)(ssr, dx), (std::max)(dy, dz));
 
-        distance = dx + dy + dz - ssr;
+        distance = ssr - dx - dy - dz;
 
         // Is the box fully contained in the sphere?
         if (distance > eps)