diff --git a/demo.py b/demo.py
index 5314b4e8c9..73a31e557e 100755
--- a/demo.py
+++ b/demo.py
@@ -120,7 +120,7 @@ def demo(opt):
 
     """ vocab / character number configuration """
     if opt.sensitive:
-        opt.character = string.printable[:-6]  # same with ASTER setting (use 94 char).
+        opt.character = string.printable[:-38]  # same with ASTER setting (use 94 char).
 
     cudnn.benchmark = True
     cudnn.deterministic = True