diff --git a/data-structures/src/main/java/com/baeldung/tree/BinaryTree.java b/data-structures/src/main/java/com/baeldung/tree/BinaryTree.java
index bb62714006..7469e8ba64 100644
--- a/data-structures/src/main/java/com/baeldung/tree/BinaryTree.java
+++ b/data-structures/src/main/java/com/baeldung/tree/BinaryTree.java
@@ -142,7 +142,7 @@ public class BinaryTree {
                 nodes.add(node.left);
             }
 
-            if (node.left != null) {
+            if (node.right != null) {
                 nodes.add(node.right);
             }
         }