diff --git a/commit-reach.c b/commit-reach.c
index 2e33c599a8..58267d5420 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -936,6 +936,8 @@ struct commit_list *get_reachable_subset(struct commit **from, int nr_from,
 		}
 	}
 
+	clear_prio_queue(&queue);
+
 	clear_commit_marks_many(nr_to, to, PARENT1);
 	clear_commit_marks_many(nr_from, from, PARENT2);