diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Position.java b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
index bc95a70..6ba3e62 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Position.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Position.java
@@ -10,8 +10,9 @@
     private HashMap<String, Integer> positionMap = new HashMap<>();
     private ArrayList<HashMap<String, Integer>> positionList = new ArrayList<>();
 
-    public void putPosition(String coordinate, Integer value) {
-        this.positionMap.put(coordinate, value);
+    public void putPosition(Integer x, Integer y) {
+        this.positionMap.put("x", x);
+        this.positionMap.put("y", y);
         this.positionList.add(this.positionMap);
     }
 
diff --git a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
index 636aadf..0cafbd3 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
@@ -76,8 +76,7 @@
     @POST
     @Produces(MediaType.APPLICATION_JSON)
     public void addPositions(@PathParam("aid") Integer aid, @FormParam("x") Integer x, @FormParam("y") Integer y) {
-        Position.putPosition("x", x);
-        Position.putPosition("y", y);
+        Position.putPosition(x, y);
     }
 }