diff --git a/playground/server.go b/playground/server.go
index 1cfd61f..5415265 100644
--- a/playground/server.go
+++ b/playground/server.go
@@ -122,13 +122,6 @@ func (p *peerState) setRoom(roomID string, info roomInfo) {
 	p.mu.Unlock()
 }
 
-func (p *peerState) roomFor(roomID string) (roomInfo, bool) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	info, ok := p.rooms[roomID]
-	return info, ok
-}
-
 // ---------------------------------------------------------------------------
 // Hub: the registry of peers, protected by a single mutex.
 // ---------------------------------------------------------------------------