diff --git a/libs/backends/coreaudio/coreaudio_pcmio.cc b/libs/backends/coreaudio/coreaudio_pcmio.cc
index 26231dad62..ca0a57de43 100644
--- a/libs/backends/coreaudio/coreaudio_pcmio.cc
+++ b/libs/backends/coreaudio/coreaudio_pcmio.cc
@@ -595,6 +595,9 @@ CoreAudioPCM::discover()
 		free(_device_outs); _device_outs = 0;
 	}
 	_devices.clear();
+	_input_devices.clear();
+	_output_devices.clear();
+	_duplex_devices.clear();
 
 	err = GetHardwarePropertyInfoWrapper (kAudioHardwarePropertyDevices, &size);