diff --git a/lib/pages/chat/recording_dialog.dart b/lib/pages/chat/recording_dialog.dart
index 86d6cbb6..1057ce6a 100644
--- a/lib/pages/chat/recording_dialog.dart
+++ b/lib/pages/chat/recording_dialog.dart
@@ -46,7 +46,16 @@ class RecordingDialogState extends State<RecordingDialog> {
         return;
       }
       await WakelockPlus.enable();
+
+      // We try to pick Opus where supported, since that is a codec optimized
+      // for speech as well as what the voice messages MSC uses.
+      final audioCodec =
+          (await _audioRecorder.isEncoderSupported(AudioEncoder.opus))
+              ? AudioEncoder.opus
+              : AudioEncoder.aacLc;
+
       await _audioRecorder.start(
+        encoder: audioCodec,
         path: _recordedPath,
         bitRate: bitRate,
         samplingRate: samplingRate,