diff --git a/acme/acme/jose/errors.py b/acme/acme/jose/errors.py
index 74708c4a4..74c9443e1 100644
--- a/acme/acme/jose/errors.py
+++ b/acme/acme/jose/errors.py
@@ -8,6 +8,10 @@ class Error(Exception):
 class DeserializationError(Error):
     """JSON deserialization error."""
 
+    def __str__(self):
+        return "Deserialization error: {0}".format(
+            super(DeserializationError, self).__str__())
+
 
 class SerializationError(Error):
     """JSON serialization error."""