diff --git a/src/network/knownnodes.py b/src/network/knownnodes.py
index cf7dfd22..a17fae58 100644
--- a/src/network/knownnodes.py
+++ b/src/network/knownnodes.py
@@ -138,6 +138,9 @@ def addKnownNode(stream, peer, lastseen=None, is_self=False):
         except KeyError:
             pass
         except TypeError:
+            # don't update expired node if have enough nodes in that stream
+            if len(knownNodes[stream]) > 64:
+                return
             rating = -0.2
         else:
             return