diff --git a/demo/Main.py b/demo/Main.py
index e0b440b0..b7c4b36b 100644
--- a/demo/Main.py
+++ b/demo/Main.py
@@ -968,7 +968,8 @@ def SearchDemo(name, keyword):
     fullText = fid.read()
     fid.close()
 
-    fullText = fullText.decode("iso-8859-1")
+    if six.PY2:
+        fullText = fullText.decode("iso-8859-1")
 
     if fullText.find(keyword) >= 0:
         return True