diff --git a/libs/backends/portaudio/portaudio_backend.h b/libs/backends/portaudio/portaudio_backend.h
index 692e4c0e61..601c3433cb 100644
--- a/libs/backends/portaudio/portaudio_backend.h
+++ b/libs/backends/portaudio/portaudio_backend.h
@@ -179,7 +179,6 @@ class PortAudioBackend : public AudioBackend {
 		bool get_use_buffered_io () { return _use_blocking_api; }
 
 		bool use_separate_input_and_output_devices () const;
-		bool match_input_output_devices_or_none () const { return true; }
 		std::vector<DeviceStatus> enumerate_devices () const;
 		std::vector<DeviceStatus> enumerate_input_devices () const;
 		std::vector<DeviceStatus> enumerate_output_devices () const;