diff --git a/src/plastic_phenopowerlaw.f90 b/src/plastic_phenopowerlaw.f90
index 5df23da94..0fe63737e 100644
--- a/src/plastic_phenopowerlaw.f90
+++ b/src/plastic_phenopowerlaw.f90
@@ -595,7 +595,7 @@ subroutine plastic_phenopowerlaw_results(instance,group)
      case (resistance_slip_ID)
        call results_writeVectorDataset(group,stt%xi_slip,'xi_slip','Pa')
      case (accumulatedshear_slip_ID)
-       call results_writeVectorDataset(group,stt%gamma_slip,'gamma_slip','1/s')
+       call results_writeVectorDataset(group,stt%gamma_slip,'gamma_slip','-')
    end select
  enddo outputsLoop
  end associate