diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index a90327b0cc3e..d8dfafeab80e 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3481,8 +3481,10 @@ static int stac92xx_auto_create_dmic_input_ctls(struct hda_codec *codec,
 				return err;
 		}
 
-		if (snd_hda_get_bool_hint(codec, "separate_dmux") != 1)
+		if (snd_hda_get_bool_hint(codec, "separate_dmux") != 1) {
 			snd_hda_add_imux_item(imux, label, index, NULL);
+			spec->num_analog_muxes++;
+		}
 	}
 
 	return 0;