diff --git a/bumble/a2dp.py b/bumble/a2dp.py
index b16de874..9be306da 100644
--- a/bumble/a2dp.py
+++ b/bumble/a2dp.py
@@ -923,7 +923,7 @@ async def generate_frames() -> AsyncGenerator[OpusPacket, None]:
                             logger.debug("first packet (header)")
                             if packet[:8] != b"OpusHead":
                                 raise ValueError("first packet is not OpusHead")
-                            packet_count = (
+                            channel_mode = (
                                 OpusPacket.ChannelMode.MONO
                                 if packet[9] == 1
                                 else OpusPacket.ChannelMode.STEREO
diff --git a/tests/a2dp_test.py b/tests/a2dp_test.py
index 54fb591c..a08a0a75 100644
--- a/tests/a2dp_test.py
+++ b/tests/a2dp_test.py
@@ -489,6 +489,33 @@ async def test_opus_parser():
         assert packet.payload == audio_data_packet
 
 
+# -----------------------------------------------------------------------------
+async def test_opus_parser_mono():
+    page_header = (
+        b'OggS'  # Capture pattern
+        + b'\x00'  # Version
+        + b'\x02'  # Header type
+        + struct.pack("<QIIIB", 0, 2, 2, 0, 3)
+    )
+    segment_table = b'\x0a\x08\x0a'
+    opus_head_packet_data = b'OpusHead' + b'\x01' + b'\x01'  # 1 channel
+    opus_tags_packet_data = b'OpusTags'
+    audio_data_packet = b'0123456789'
+
+    data = Data(
+        page_header
+        + segment_table
+        + opus_head_packet_data
+        + opus_tags_packet_data
+        + audio_data_packet
+    )
+
+    packets = [packet async for packet in a2dp.OpusParser(data.read).packets]
+    assert len(packets) == 1
+    assert packets[0].channel_mode == a2dp.OpusPacket.ChannelMode.MONO
+    assert packets[0].payload == audio_data_packet
+
+
 # -----------------------------------------------------------------------------
 async def test_opus_packet_source():
     packed_header_data_revised = struct.pack(