diff --git a/kernel/fork.c b/kernel/fork.c
index 418b52a..5a547a5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -543,6 +543,7 @@
 	atomic_long_set(&mm->nr_ptes, 0);
 	mm->map_count = 0;
 	mm->locked_vm = 0;
+	mm->pinned_vm = 0;
 	memset(&mm->rss_stat, 0, sizeof(mm->rss_stat));
 	spin_lock_init(&mm->page_table_lock);
 	mm_init_cpumask(mm);