diff --git a/lib/msprime.c b/lib/msprime.c
index ec2ed4a71..50ce93580 100644
--- a/lib/msprime.c
+++ b/lib/msprime.c
@@ -2668,6 +2668,7 @@ msp_move_individual(msp_t *self, avl_node_t *node, avl_tree_t *source,
             goto out;
         }
     }
+    lineage_reset_segments(ind);
     ret = msp_insert_individual(self, ind);
 out:
     return ret;
@@ -6065,6 +6066,7 @@ msp_sweep_recombination_event(
     if (ret != 0) {
         goto out;
     }
+
     tsk_bug_assert(lhs->lineage != NULL);
     tsk_bug_assert(rhs->lineage != NULL);
 
@@ -6147,7 +6149,6 @@ msp_run_sweep(msp_t *self)
     if (ret != 0) {
         goto out;
     }
-    msp_verify(self, 0);
     ret = msp_sweep_initialise(self, allele_frequency[0]);
     if (ret != 0) {
         goto out;
@@ -6156,7 +6157,6 @@ msp_run_sweep(msp_t *self)
     curr_step = 1;
     while (msp_get_num_ancestors(self) > 0 && curr_step < num_steps) {
         events++;
-        msp_verify(self, 0);
         /* Set pop sizes & rec_rates */
         for (j = 0; j < self->num_labels; j++) {
             label = (label_id_t) j;