diff --git a/cvin.cpp b/cvin.cpp
index b218cee..bf4caad 100644
--- a/cvin.cpp
+++ b/cvin.cpp
@@ -99,7 +99,7 @@ void CVIn::start()
 	m_ports = new jack_port_t *[m_mapping_list.size()];
 	m_buffers = new sample_t *[m_mapping_list.size()];
 
-	open(m_config_name.empty() ? "m2cv_in" : m_config_name.c_str());
+	if (!open(m_config_name.empty() ? "m2cv_in" : m_config_name.c_str())) exit(EXIT_FAILURE);
 
 	m_midi_out = port_register("midi_out", JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
 
diff --git a/cvout.cpp b/cvout.cpp
index 6f18595..eeb13a3 100644
--- a/cvout.cpp
+++ b/cvout.cpp
@@ -125,7 +125,7 @@ void CVOut::start()
 	m_ports = new jack_port_t *[m_mapping_list.size()];
 	m_buffers = new sample_t *[m_mapping_list.size()];
 
-	open(m_config_name.empty() ? "m2cv_out" : m_config_name.c_str());
+	if (!open(m_config_name.empty() ? "m2cv_out" : m_config_name.c_str())) exit(EXIT_FAILURE);
 
 	m_midi_in = port_register("midi_in", JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);