diff --git a/include/linux/wait.h b/include/linux/wait.h
index bc4f389..794be7a 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -77,9 +77,15 @@
 #define __WAIT_BIT_KEY_INITIALIZER(word, bit)				\
 	{ .flags = word, .bit_nr = bit, }
 
+/*
+ * lockdep: we want one lock-class for all waitqueue locks.
+ */
+extern struct lock_class_key waitqueue_lock_key;
+
 static inline void init_waitqueue_head(wait_queue_head_t *q)
 {
 	spin_lock_init(&q->lock);
+	lockdep_set_class(&q->lock, &waitqueue_lock_key);
 	INIT_LIST_HEAD(&q->task_list);
 }