diff --git a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
index ebeba06e5..5be036ad5 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
@@ -117,7 +117,11 @@ export function Prompt(props: PromptProps) {
   const dialog = useDialog()
   const toast = useToast()
   const status = createMemo(() => sync.data.session_status?.[props.sessionID ?? ""] ?? { type: "idle" })
-  const sessionInterruptTimeout = createMemo(() => sync.data.config.tui?.session_interrupt_timeout_ms ?? 5000)
+  const sessionInterruptTimeout = createMemo(() => {
+    const timeout = (sync.data.config as { tui?: { session_interrupt_timeout_ms?: number } }).tui
+      ?.session_interrupt_timeout_ms
+    return typeof timeout === "number" ? timeout : 5000
+  })
   const history = usePromptHistory()
   const command = useCommandDialog()
   const renderer = useRenderer()