diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index 81e79669fd..ffb1f6a6fa 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -89,6 +89,8 @@ AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
 
 AlsaAudioBackend::~AlsaAudioBackend ()
 {
+	clear_ports ();
+
 	pthread_mutex_destroy (&_port_callback_mutex);
 	pthread_mutex_destroy (&_device_port_mutex);
 }
diff --git a/libs/backends/coreaudio/coreaudio_backend.cc b/libs/backends/coreaudio/coreaudio_backend.cc
index 7afc40183e..2c4e03e116 100644
--- a/libs/backends/coreaudio/coreaudio_backend.cc
+++ b/libs/backends/coreaudio/coreaudio_backend.cc
@@ -129,6 +129,9 @@ CoreAudioBackend::~CoreAudioBackend ()
 {
 	delete _pcmio; _pcmio = 0;
 	delete _midiio; _midiio = 0;
+
+	clear_ports ();
+
 	pthread_mutex_destroy (&_port_callback_mutex);
 	pthread_mutex_destroy (&_port_registration_mutex);
 	pthread_mutex_destroy (&_process_callback_mutex);
diff --git a/libs/backends/jack/jack_audiobackend.cc b/libs/backends/jack/jack_audiobackend.cc
index d33d3d6c5f..254dfa4147 100644
--- a/libs/backends/jack/jack_audiobackend.cc
+++ b/libs/backends/jack/jack_audiobackend.cc
@@ -72,6 +72,7 @@ JACKAudioBackend::JACKAudioBackend (AudioEngine& e, AudioBackendInfo& info, boos
 
 JACKAudioBackend::~JACKAudioBackend()
 {
+	_jack_ports.clear ();
 }
 
 string
diff --git a/libs/backends/portaudio/portaudio_backend.cc b/libs/backends/portaudio/portaudio_backend.cc
index ba72910d44..779bfc423b 100644
--- a/libs/backends/portaudio/portaudio_backend.cc
+++ b/libs/backends/portaudio/portaudio_backend.cc
@@ -106,6 +106,8 @@ PortAudioBackend::~PortAudioBackend ()
 	delete _pcmio; _pcmio = 0;
 	delete _midiio; _midiio = 0;
 
+	clear_ports ();
+
 	pthread_mutex_destroy (&_port_callback_mutex);
 	pthread_mutex_destroy (&_freewheel_mutex);
 	pthread_cond_destroy (&_freewheel_signal);
diff --git a/libs/backends/pulseaudio/pulseaudio_backend.cc b/libs/backends/pulseaudio/pulseaudio_backend.cc
index d16ea73bf2..2af182a94e 100644
--- a/libs/backends/pulseaudio/pulseaudio_backend.cc
+++ b/libs/backends/pulseaudio/pulseaudio_backend.cc
@@ -69,6 +69,8 @@ PulseAudioBackend::PulseAudioBackend (AudioEngine& e, AudioBackendInfo& info)
 
 PulseAudioBackend::~PulseAudioBackend ()
 {
+	clear_ports ();
+
 	pthread_mutex_destroy (&_port_callback_mutex);
 }