diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
index b659ccf..27a0edd 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
@@ -25,11 +25,11 @@
         return this.thickness;
     }
 
-    //座標のリストを返す
+    //座標のリストを返す//
     public List<Position> getPositions() {
 
         List<Position> positions = new ArrayList();
-        for (Position p: positions) {
+        for (Position p: this.positions) {
             positions.add(p);
         }