diff --git a/src/simplex/spydual.c b/src/simplex/spydual.c
index e41baf2..d33ebb1 100644
--- a/src/simplex/spydual.c
+++ b/src/simplex/spydual.c
@@ -1374,13 +1374,15 @@ loop: /* main loop starts here */
       check_accuracy(csa);
 #endif
       /* check if the objective limit has been reached */
-#if PERTURB
-      /* FIXME */
-      if (!perturb)
-#endif
       if (csa->phase == 2 && csa->obj_lim != DBL_MAX
          && spx_eval_obj(lp, beta) >= csa->obj_lim)
-      {  if (csa->beta_st != 1)
+      {  if (perturb)
+         {  /* remove perturbation */
+            perturb = 0;
+            memcpy(csa->lp->c, csa->orig_c, (1+n) * sizeof(double));
+            csa->phase = csa->d_st = 0;
+         }
+         if (csa->beta_st != 1)
             csa->beta_st = 0;
          if (csa->d_st != 1)
             csa->d_st = 0;