diff --git a/opencode-tools.el b/opencode-tools.el
index 1567b6f..047cfcc 100644
--- a/opencode-tools.el
+++ b/opencode-tools.el
@@ -126,7 +126,7 @@ the action resolves to `ask'."
                             (upcase (symbol-name (or (plist-get diag :severity) 'info)))
                             (plist-get diag :message)))))
       (when lines
-        (string-join lines "\n"))))
+        (string-join lines "\n")))))
 
 (defun opencode--append-diagnostics (base-output diagnostics)
   "Append DIAGNOSTICS string to BASE-OUTPUT when present."