diff --git a/code/damage_isoBrittle.f90 b/code/damage_isoBrittle.f90
index 9c13ab338..6d3037e19 100644
--- a/code/damage_isoBrittle.f90
+++ b/code/damage_isoBrittle.f90
@@ -312,7 +312,7 @@ subroutine damage_isoBrittle_microstructure(C, Fe, subdt, ipc, ip, el)
  damageState(phase)%state(1,constituent) = &
    damageState(phase)%state(2,constituent) + &
    (damageState(phase)%subState0(1,constituent) - damageState(phase)%state(2,constituent))* &
-   exp(-subdt/(damageState(phase)%state(2,constituent)*lattice_DamageMobility(phase)))
+   exp(-subdt/lattice_DamageMobility(phase))
               
 end subroutine damage_isoBrittle_microstructure