diff --git a/src/collision/collision_regime.f90 b/src/collision/collision_regime.f90
index 14d1286e1..d49202fa6 100644
--- a/src/collision/collision_regime.f90
+++ b/src/collision/collision_regime.f90
@@ -186,7 +186,7 @@ subroutine collision_regime_LS12_SI(Mcb, m1, m2, rad1, rad2, rh1, rh2, vb1, vb2,
       real(DP)           :: a1, alpha, aint, b, bcrit, c_star, egy, zeta, l, lint, mu, phi, theta, ke, pe
       real(DP)           :: Qr, Qrd_pstar, Qr_erosion, Qr_supercat
       real(DP)           :: Vhr, Verosion, Vescp, Vhill, Vimp, Vsupercat
-      real(DP)           :: Mint, Mtot, Mtmp
+      real(DP)           :: Mint, Mtot, Mtmp, Mbig, Msmall
       real(DP)           :: Rp, rhill 
       real(DP)           :: Mresidual
       real(DP)           :: U_binding
@@ -282,8 +282,9 @@ subroutine collision_regime_LS12_SI(Mcb, m1, m2, rad1, rad2, rh1, rh2, vb1, vb2,
       else 
          Mlr = max((1.0_DP - Qr / Qrd_pstar / 2.0_DP) * Mtot, min_mfrag) ! [kg] # LS12 eq (5)
       end if
-
-      Mslr_hitandrun = max(calc_Qrd_rev(m2, m1, Mint, den1, den2, Vimp, c_star), min_mfrag)
+      Mbig = max(m1,Mlr)
+      Msmall = mtot - Mbig
+      Mslr_hitandrun = max(calc_Qrd_rev(Msmall, Mbig, Mint, den1, den2, Vimp, c_star), min_mfrag)
       if (regime == COLLRESOLVE_REGIME_HIT_AND_RUN ) then
          Mslr = Mslr_hitandrun
       else
diff --git a/src/fraggle/fraggle_util.f90 b/src/fraggle/fraggle_util.f90
index 68e629338..e5956933f 100644
--- a/src/fraggle/fraggle_util.f90
+++ b/src/fraggle/fraggle_util.f90
@@ -80,7 +80,7 @@ module subroutine fraggle_util_set_mass_dist(self, param)
             mremaining = impactors%mass_dist(iMrem)
             do while (i <= nfrag)
                mfrag = (1 + i - iMslr)**(-3._DP / BETA) * impactors%mass_dist(iMslr)
-               if (mremaining - mfrag < 0.0_DP) exit
+               if (mremaining - mfrag <= 0.0_DP) exit
                mremaining = mremaining - mfrag
                i = i + 1
             end do