diff --git a/setup.py b/setup.py
index 9a3c9277..007e9029 100644
--- a/setup.py
+++ b/setup.py
@@ -132,7 +132,7 @@ def run(self):
             [('MODULE_NAME', self.distribution.metadata.name), ('MODULE_VERSION', self.distribution.metadata.version)]
         )
         # escape the XMLSEC_CRYPTO macro value, see mehcode/python-xmlsec#141
-        for (key, value) in ext.define_macros:
+        for key, value in ext.define_macros:
             if key == 'XMLSEC_CRYPTO' and not (value.startswith('"') and value.endswith('"')):
                 ext.define_macros.remove((key, value))
                 ext.define_macros.append((key, '"{0}"'.format(value)))