diff --git a/sound/ppc/pmac.c b/sound/ppc/pmac.c
index 844d761..c89e82e 100644
--- a/sound/ppc/pmac.c
+++ b/sound/ppc/pmac.c
@@ -765,7 +765,8 @@
  */
 static void snd_pmac_sound_feature(pmac_t *chip, int enable)
 {
-	ppc_md.feature_call(PMAC_FTR_SOUND_CHIP_ENABLE, chip->node, 0, enable);
+	if (ppc_md.feature_call)
+		ppc_md.feature_call(PMAC_FTR_SOUND_CHIP_ENABLE, chip->node, 0, enable);
 }
 
 /*