diff --git a/spa/plugins/alsa/acp/acp.c b/spa/plugins/alsa/acp/acp.c
index 9cf8859b0..df4866525 100644
--- a/spa/plugins/alsa/acp/acp.c
+++ b/spa/plugins/alsa/acp/acp.c
@@ -67,7 +67,7 @@ static const uint32_t channel_table[PA_CHANNEL_POSITION_MAX] = {
 	[PA_CHANNEL_POSITION_AUX10] = ACP_CHANNEL_START_Aux + 10,
 	[PA_CHANNEL_POSITION_AUX11] = ACP_CHANNEL_START_Aux + 11,
 	[PA_CHANNEL_POSITION_AUX12] = ACP_CHANNEL_START_Aux + 12,
-	[PA_CHANNEL_POSITION_AUX13] = ACP_CHANNEL_START_Aux + 12,
+	[PA_CHANNEL_POSITION_AUX13] = ACP_CHANNEL_START_Aux + 13,
 	[PA_CHANNEL_POSITION_AUX14] = ACP_CHANNEL_START_Aux + 14,
 	[PA_CHANNEL_POSITION_AUX15] = ACP_CHANNEL_START_Aux + 15,
 	[PA_CHANNEL_POSITION_AUX16] = ACP_CHANNEL_START_Aux + 16,