diff --git a/synapse/rest/voip.py b/synapse/rest/voip.py
index 31f3fd100d..a3a8842cb6 100644
--- a/synapse/rest/voip.py
+++ b/synapse/rest/voip.py
@@ -33,7 +33,7 @@ class VoipRestServlet(RestServlet):
         turnUris = self.hs.config.turn_uris
         turnSecret = self.hs.config.turn_shared_secret
         userLifetime = self.hs.config.turn_user_lifetime
-        if not turnUri or not turnSecret or not userLifetime:
+        if not turnUris or not turnSecret or not userLifetime:
             defer.returnValue( (200, {"uris": []}) )
 
         expiry = self.hs.get_clock().time_msec() + userLifetime