diff --git a/gdata-characteristic.js b/gdata-characteristic.js
index 79e5b1a..25e75c5 100644
--- a/gdata-characteristic.js
+++ b/gdata-characteristic.js
@@ -69,7 +69,7 @@ function printString(str){
     .align('ct')
     .size(1,1)
   for(let i in strs){
-    printer.text(strs[i])
+    printer.text(strs[i], 'big5')
   }
   printer.cut(true, 8)
 }