diff --git a/RNS/Cryptography/HMAC.py b/RNS/Cryptography/HMAC.py
index 848a2313..9996083c 100644
--- a/RNS/Cryptography/HMAC.py
+++ b/RNS/Cryptography/HMAC.py
@@ -180,4 +180,9 @@ def digest(key, msg, digest):
     outer.update(key.translate(trans_5C))
     inner.update(msg)
     outer.update(inner.digest())
-    return outer.digest()
\ No newline at end of file
+    return outer.digest()
+
+def _cd_internal(a, b): return a == b
+try: from hmac import compare_digest as _cd
+except ImportError: _cd = _cd_internal
+compare_digest = _cd
\ No newline at end of file
diff --git a/RNS/Cryptography/Token.py b/RNS/Cryptography/Token.py
index c0e457d6..fb9577aa 100644
--- a/RNS/Cryptography/Token.py
+++ b/RNS/Cryptography/Token.py
@@ -80,7 +80,7 @@ class Token():
             received_hmac = token[-32:]
             expected_hmac = HMAC.new(self._signing_key, token[:-32]).digest()
 
-            if received_hmac == expected_hmac: return True
+            if HMAC.compare_digest(received_hmac, expected_hmac): return True
             else: return False