diff --git a/crates/projection-irc/src/lib.rs b/crates/projection-irc/src/lib.rs
index 0bf77fb..6b4374c 100644
--- a/crates/projection-irc/src/lib.rs
+++ b/crates/projection-irc/src/lib.rs
@@ -894,24 +894,32 @@ async fn handle_join(
     match chan {
         Chan::Global(chan_name) => {
             let room_id = RoomId::from(chan_name.clone())?;
-            if let JoinResult::Success(room_info) = user_handle.join_room(room_id).await? {
-                produce_on_join_cmd_messages(&config, &user, chan, &room_info, writer).await?;
-            } else {
-                ServerMessage {
-                    tags: vec![],
-                    sender: Some(config.server_name.clone()),
-                    body: ServerMessageBody::N474BannedFromChan {
-                        client: user.nickname.clone(),
-                        chan: chan.clone(),
-                        message: "U dun goofed".into(),
-                    },
+            match user_handle.join_room(room_id).await? {
+                JoinResult::Success(room_info) => {
+                    produce_on_join_cmd_messages(&config, &user, chan, &room_info, writer).await?;
+                }
+                JoinResult::AlreadyJoined => {
+                    // we do nothing on repeated joins
+                }
+                JoinResult::Banned => {
+                    ServerMessage {
+                        tags: vec![],
+                        sender: Some(config.server_name.clone()),
+                        body: ServerMessageBody::N474BannedFromChan {
+                            client: user.nickname.clone(),
+                            chan: chan.clone(),
+                            message: "U dun goofed".into(),
+                        },
+                    }
+                    .write_async(writer)
+                    .await?;
                 }
-                .write_async(writer)
-                .await?;
             }
             writer.flush().await?;
         }
-        Chan::Local(_) => {}
+        Chan::Local(_) => {
+            // TODO handle join attempts to local chans with an error, we don't support these
+        }
     };
     Ok(())
 }