diff --git a/f8/timer.h b/f8/timer.h
index 174bcce..e3e0b61 100644
--- a/f8/timer.h
+++ b/f8/timer.h
@@ -10,7 +10,7 @@ namespace f8
     public:
         TimerWp(a8::XTimerWp wp): p_(wp) {};
         bool expired() { return p_.expired();};
-        auto&& lock() { return p_.lock(); };
+        auto lock() { return p_.lock(); };
 
     private:
         a8::XTimerWp p_;