1 files changed, 1 insertions, 1 deletions
diff --git a/gr-blocks/lib/delay_impl.h b/gr-blocks/lib/delay_impl.h
index c58de83668..2b39e64ce5 100644
--- a/gr-blocks/lib/delay_impl.h
+++ b/gr-blocks/lib/delay_impl.h
@@ -24,7 +24,7 @@ private:
 
     const size_t d_itemsize;
     int d_delta;
-    gr::thread::mutex d_mutex_delay;
+    void handle_msg(pmt::pmt_t msg);
 
 public:
     delay_impl(size_t itemsize, int delay);