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-rw-r--r--cryptography/primitives/block/ciphers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/cryptography/primitives/block/ciphers.py b/cryptography/primitives/block/ciphers.py
index 2e478705..cf54aa35 100644
--- a/cryptography/primitives/block/ciphers.py
+++ b/cryptography/primitives/block/ciphers.py
@@ -25,7 +25,7 @@ class AES(object):
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
- raise ValueError("Invalid key size (%s) for %s".format(
+ raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))