diff --git a/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java b/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
index 9e49d1c..2c50ffa 100644
--- a/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
+++ b/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
@@ -119,9 +119,9 @@
         updateDno(rid, nickName);
     }
     public String putDrawing(){
-        String source = "サンプル";
-        Charset charset = StandardCharsets.UTF_8;
-        String result = Base64.getEncoder().encodeToString(source.getBytes(charset));
-        return result;
+        String string = "sample";
+        Base64.Encoder encoder = Base64.getEncoder();
+        String encoded = encoder.encodeToString(string.getBytes());
+        return encoded;
     }
 }