diff --git a/src/main/java/com/thealgorithms/datastructures/graphs/A_Star.java b/src/main/java/com/thealgorithms/datastructures/graphs/A_Star.java
index 610b364b35fb..44f5eadaab1c 100644
--- a/src/main/java/com/thealgorithms/datastructures/graphs/A_Star.java
+++ b/src/main/java/com/thealgorithms/datastructures/graphs/A_Star.java
@@ -16,7 +16,7 @@ private static class Graph {
         public Graph(int size) {
             this.graph = new ArrayList<>();
             for (int i = 0; i < size; i++) {
-                this.graph.set(i, new ArrayList<>());
+                this.graph.add(new ArrayList<>());
             }
         }