diff --git a/shadowsocks/crypto/sodium.py b/shadowsocks/crypto/sodium.py
index f27ae20..b744e2c 100644
--- a/shadowsocks/crypto/sodium.py
+++ b/shadowsocks/crypto/sodium.py
@@ -136,4 +136,4 @@ def test_chacha20_ietf():
 if __name__ == '__main__':
     test_chacha20()
     test_salsa20()
-    test_chacha20_ietf()
\ No newline at end of file
+    test_chacha20_ietf()