diff --git a/adapters/vim/collab.vim b/adapters/vim/collab.vim
index eaea43e..239e454 100644
--- a/adapters/vim/collab.vim
+++ b/adapters/vim/collab.vim
@@ -41,14 +41,14 @@ def OnOutput(ch: channel, msg: string): void
         ready = true
     elseif data.type == 'connected'
         connected = true
-        echom '[collab] connected to room: ' .. data.room
+        echom $'[collab] connected to room: {data.room}'
     elseif data.type == 'disconnected'
         connected = false
         echom '[collab] disconnected'
     elseif data.type == 'content'
         ApplyRemoteContent(data.text)
     elseif data.type == 'peers'
-        echom '[collab] peers: ' .. data.count
+        echom $'[collab] peers: {data.count}'
     elseif data.type == 'cursor'
         ShowPeerCursor(data.data)
     elseif data.type == 'error'
@@ -100,7 +100,7 @@ def ShowPeerCursor(data: dict<any>): void
     const col_nr = data.col + 1
 
     # Create a 1-char highlight at cursor position
-    const pattern = '\%' .. line_nr .. 'l\%' .. col_nr .. 'c.'
+    const pattern = $'\%{line_nr}l\%{col_nr}c.'
     peer_match_ids[client_id] = matchadd('PeerCursor', pattern, 10)
 enddef
 
@@ -167,7 +167,7 @@ enddef
 
 export def Status(): void
     if connected
-        echom '[collab] connected to room: ' .. room
+        echom $'[collab] connected to room: {room}'
     else
         echom '[collab] not connected'
     endif