diff --git a/subjects/sametree.en.md b/subjects/sametree.en.md
index 13e5bd6e..9418f2d1 100644
--- a/subjects/sametree.en.md
+++ b/subjects/sametree.en.md
@@ -23,9 +23,9 @@ Write a function, `IsSameTree`, that returns `bool`.
 
 ```go
 type TreeNodeL struct {
-    Left    *TreeNodeM
+    Left    *TreeNodeL
     Val     int
-    Right   *TreeNodeM
+    Right   *TreeNodeL
 }