diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index fb14ce4a49c3..ab14876bebf7 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3319,6 +3319,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
 			l_mas->index = l_mas->min;
 
 		l_mas->offset = l_slot - 1;
+		l_wr_mas->r_min = l_mas->index;
 	}
 
 	if (!r_wr_mas->content) {
@@ -3331,6 +3332,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
 		r_mas->last = mas_safe_pivot(r_mas, r_wr_mas->pivots,
 					     r_wr_mas->type, r_mas->offset + 1);
 		r_mas->offset++;
+		r_wr_mas->r_max = r_mas->last;
 	}
 }