diff --git a/src/common/stanza_session.py b/src/common/stanza_session.py
index f136e292f4701e739b53a77e3ec2120bb2b3f5d3..9f92c2f17fdaa95a73c5b626676dddf6eaa99728 100644
--- a/src/common/stanza_session.py
+++ b/src/common/stanza_session.py
@@ -542,7 +542,7 @@ class EncryptedStanzaSession(StanzaSession):
 			',') ]
 
 		x.addChild(node=xmpp.DataField(name='modp', typ='list-single',
-			options=[[None, x] for x in modp_options]))
+			options=[[None, y] for y in modp_options]))
 
 		x.addChild(node=self.make_dhfield(modp_options, sigmai))
 		self.sigmai = sigmai