diff --git a/src/symba/symba_collision.f90 b/src/symba/symba_collision.f90
index fd4eae517..798d1698d 100644
--- a/src/symba/symba_collision.f90
+++ b/src/symba/symba_collision.f90
@@ -915,6 +915,7 @@ subroutine symba_collision_mergeaddsub(system, param, family, id_frag, Ip_frag,
                end if
 
                call plnew%set_mu(cb)
+               call plnew%set_rhill(cb)
                !Copy over or set integration parameters for new bodies
                plnew%lcollision(1:nfrag) = .false.
                plnew%ldiscard(1:nfrag) = .false.