diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 4110de9fe190..e75512dd9733 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -812,7 +812,7 @@ void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
-		if (ws->active) {
+		if (ws->active && len < max) {
 			if (!active)
 				len += scnprintf(pending_wakeup_source, max,
 						"Pending Wakeup Sources: ");