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..8412f9d 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
@@ -29,7 +29,7 @@
     public List<Position> getPositions() {
 
         List<Position> positions = new ArrayList();
-        for (Position p: positions) {
+        for (Position p: this.positions) {
             positions.add(p);
         }