diff --git a/src/features/tmux-subagent/manager.ts b/src/features/tmux-subagent/manager.ts
index 3340fb55d..a8d93ca16 100644
--- a/src/features/tmux-subagent/manager.ts
+++ b/src/features/tmux-subagent/manager.ts
@@ -72,8 +72,7 @@ export class TmuxSessionManager {
     this.client = ctx.client
     this.tmuxConfig = tmuxConfig
     this.deps = deps
-    const defaultPort = process.env.OPENCODE_PORT ?? "4096"
-    const fallbackUrl = `http://localhost:${defaultPort}`
+    const fallbackUrl = "http://localhost:4096"
     const rawServerUrl = ctx.serverUrl?.toString()
     try {
       if (rawServerUrl) {