diff --git a/tools/topology/sof-tgl-sdw-max98373-rt5682.m4 b/tools/topology/sof-tgl-sdw-max98373-rt5682.m4
index 3d211cf2850c..34d30572e05c 100644
--- a/tools/topology/sof-tgl-sdw-max98373-rt5682.m4
+++ b/tools/topology/sof-tgl-sdw-max98373-rt5682.m4
@@ -65,7 +65,7 @@ define(`SMART_RX_CHANNELS', 4)
 define(`SMART_FB_CHANNELS', 4)
 # Ref capture related
 define(`SMART_REF_PPL_ID', 4)
-define(`SMART_REF_CH_NUM', 4)
+define(`SMART_REF_CH_NUM', 2)
 # PCM related
 define(`SMART_PCM_ID', 2)
 define(`SMART_PCM_NAME', `smart373-spk')