diff --git a/src/library/flycheck.h b/src/library/flycheck.h
index fcac082b1..f7551ee25 100644
--- a/src/library/flycheck.h
+++ b/src/library/flycheck.h
@@ -10,8 +10,8 @@ Author: Leonardo de Moura
 namespace lean {
 /** \brief Auxiliary object for "inserting" delimiters for flycheck */
 class flycheck_scope {
-    io_state_stream const & m_ios;
-    bool                    m_flycheck;
+    io_state_stream m_ios;
+    bool            m_flycheck;
 public:
     flycheck_scope(io_state_stream const & ios, char const * kind);
     ~flycheck_scope();