1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/hmac.py b/Lib/hmac.py
index 52af590..079b58c 100644
--- a/Lib/hmac.py
+++ b/Lib/hmac.py
@@ -39,7 +39,7 @@ class HMAC:
             import hashlib
             digestmod = hashlib.md5
 
-        if callable(digestmod):
+        if hasattr(digestmod, '__call__'):
             self.digest_cons = digestmod
         else:
             self.digest_cons = lambda d='': digestmod.new(d)