diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 18bf79251d..c1aeea7b72 100644
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -447,7 +447,7 @@ find_mmc_part() {
 	fi
 
 	for DEVNAME in /sys/block/$ROOTDEV/mmcblk*p*; do
-		PARTNAME="$(grep PARTNAME ${DEVNAME}/uevent | cut -f2 -d'=')"
+		PARTNAME="$(grep PARTNAME ${DEVNAME}/uevent | cut -f2 -d'=' 2>/dev/null)"
 		[ "$PARTNAME" = "$1" ] && echo "/dev/$(basename $DEVNAME)" && return 0
 	done
 }