diff --git a/grid.cc b/grid.cc
index aff5804aa..c49f50d3d 100644
--- a/grid.cc
+++ b/grid.cc
@@ -2602,8 +2602,8 @@ auto get_totmassradionuclide(const int z, const int a) -> double {
   const double maxsdist = (GRID_TYPE == GridType::CARTESIAN3D)
                               ? globals::rmax * tstart / globals::tmin
                               : 2 * globals::rmax * (tstart + distance / CLIGHT_PROP) / globals::tmin;
-  assert_always(distance <= maxsdist);
-  assert_always(distance >= 0);
+
+  assert_always(distance >= 0 && distance <= maxsdist);
 
   assert_always((snext == -99) || ((snext >= 0) && (snext < grid::ngrid)));