diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 3a2e3b3..b46e3f6 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1333,7 +1333,7 @@
 	if (err)
 		return err;
 
-	if ((__be32_to_cpu(switch_status[4]) >> 24) != speed)
+	if (((__be32_to_cpu(switch_status[4]) >> 24) & 0xF) != speed)
 		return -ENOTSUPP;
 
 	return 0;