diff --git a/Demo/md5test/md5driver.py b/Demo/md5test/md5driver.py
index 7df3e757b09..7f561aba407 100644
--- a/Demo/md5test/md5driver.py
+++ b/Demo/md5test/md5driver.py
@@ -80,7 +80,7 @@ def MDFilter():
     mdContext = md5()
 
     while 1:
-        data = sys.stdin.read(16)
+        data = sys.stdin.read(16).encode()
         if not data:
             break
         mdContext.update(data)