diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/paint/PaintViewModel.java b/app/src/main/java/org/ntlab/acanthus_client/views/paint/PaintViewModel.java
index ce53a79..67043b4 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/paint/PaintViewModel.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/paint/PaintViewModel.java
@@ -81,9 +81,7 @@
     // strokeNoの発行
     public void setmStrokeNo(){
         Random random = new Random();
-        int randomValue = random.nextInt(1000000);
-        String s= acanthus.getPreferenceUid().toString()+acanthus.getAid().toString()+String.valueOf(randomValue);
-        mStrokeNo=Integer.valueOf(s);
+        mStrokeNo=random.nextInt(1000000000);
         Log.d("TAG", "setmStrokeNo: "+mStrokeNo);
     }