diff --git a/sys/dev/mmc/mmc.c b/sys/dev/mmc/mmc.c
index 4c46158b877..c75b7fd68d0 100644
--- a/sys/dev/mmc/mmc.c
+++ b/sys/dev/mmc/mmc.c
@@ -1868,7 +1868,7 @@ mmc_discover_cards(struct mmc_softc *sc)
 			 * units of 10 ms), defaulting to 500 ms.
 			 */
 			ivar->cmd6_time = 500 * 1000;
-			if (ivar->csd.spec_vers >= 6)
+			if (ivar->raw_ext_csd[EXT_CSD_REV] >= 6)
 				ivar->cmd6_time = 10 *
 				    ivar->raw_ext_csd[EXT_CSD_GEN_CMD6_TIME];
 			/* Handle HC erase sector size. */