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-rw-r--r--gnuradio-core/src/lib/general/gr_nop.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/gnuradio-core/src/lib/general/gr_nop.cc b/gnuradio-core/src/lib/general/gr_nop.cc
index ca5983c39..edfe1d76d 100644
--- a/gnuradio-core/src/lib/general/gr_nop.cc
+++ b/gnuradio-core/src/lib/general/gr_nop.cc
@@ -40,7 +40,8 @@ gr_nop::gr_nop (size_t sizeof_stream_item)
d_nmsgs_recvd(0)
{
// Arrange to have count_received_msgs called when messages are received.
- set_msg_handler(boost::bind(&gr_nop::count_received_msgs, this, _1));
+ message_port_register_in(pmt::mp("port"));
+ set_msg_handler(pmt::mp("port"), boost::bind(&gr_nop::count_received_msgs, this, _1));
}
// Trivial message handler that just counts them.