diff --git a/libp2p/pubsub/gossipsub.py b/libp2p/pubsub/gossipsub.py
index b65462d..d394e95 100644
--- a/libp2p/pubsub/gossipsub.py
+++ b/libp2p/pubsub/gossipsub.py
@@ -208,13 +208,11 @@ class GossipSub(IPubsubRouter):
             # in the fanout for a topic (or the topic is not in the fanout).
             # Selects the remaining number of peers (D-x) from peers.gossipsub[topic].
             if topic in self.pubsub.peer_topics:
-                gossipsub_peers_in_topic = [peer for peer in self.pubsub.peer_topics[topic]
-                                            if peer in self.peers_gossipsub]
-                selected_peers = \
-                    GossipSub.select_from_minus(self.degree - fanout_size,
-                                                gossipsub_peers_in_topic,
-                                                fanout_peers)
-
+                selected_peers = self._get_peers_from_minus(
+                    topic,
+                    self.degree - fanout_size,
+                    fanout_peers,
+                )
                 # Combine fanout peers with selected peers
                 fanout_peers += selected_peers
 
@@ -295,7 +293,7 @@ class GossipSub(IPubsubRouter):
                 selected_peers = GossipSub.select_from_minus(
                     self.degree - num_mesh_peers_in_topic,
                     gossipsub_peers_in_topic,
-                    self.mesh[topic]
+                    self.mesh[topic],
                 )
 
                 fanout_peers_not_in_mesh = [
diff --git a/libp2p/pubsub/pubsub.py b/libp2p/pubsub/pubsub.py
index 560b8c2..7c33d0b 100644
--- a/libp2p/pubsub/pubsub.py
+++ b/libp2p/pubsub/pubsub.py
@@ -313,9 +313,6 @@ class Pubsub:
             # Write message to stream
             await stream.write(rpc_msg)
 
-    def list_peers(self, topic_id: str) -> Tuple[ID, ...]:
-        return
-
     async def publish(self, topic_id: str, data: bytes) -> None:
         """
         Publish data to a topic