diff --git a/src/utils/sign.py b/src/utils/sign.py
index bdffe79..7df14ad 100644
--- a/src/utils/sign.py
+++ b/src/utils/sign.py
@@ -9,7 +9,7 @@ def check_signature(signature, timestamp, nonce, token):
     :param token:
     """
     unsign_str = "".join(sorted([timestamp, nonce, token]))
-    signed_str = hashlib.sha1(unsign_str).digest()
+    signed_str = hashlib.sha1(unsign_str.encode()).digest()
     if signature == signed_str:
         return True
     else: