diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index f475bac9d914..9172bcee94b4 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3258,7 +3258,7 @@ static inline void mas_destroy_rebalance(struct ma_state *mas, unsigned char end
 
 		if (tmp < max_p)
 			memset(pivs + tmp, 0,
-			       sizeof(unsigned long *) * (max_p - tmp));
+			       sizeof(unsigned long) * (max_p - tmp));
 
 		if (tmp < mt_slots[mt])
 			memset(slots + tmp, 0, sizeof(void *) * (max_s - tmp));