diff --git a/scripts/mash_run.sh b/scripts/mash_run.sh
index 2025598..14cc9cc 100755
--- a/scripts/mash_run.sh
+++ b/scripts/mash_run.sh
@@ -167,13 +167,15 @@ echo $$ > $pidfile
 
 for TAG in ${TAGS}
 do
-        ( $optionv ) && echo "Checking $TAG ..."
+    ( $optionv ) && echo "Checking $TAG ..."
+	ARCHES=""
 	BUILDTAG=""
 	LOG="${LOG_DIR}/mash.${TAG}.log"
 	FAKETAG=${TAG/testing/candidate}
 	FAKETAG=${FAKETAG/release/candidate}
 	BUILDTAG=`${KOJI} list-targets --quiet | grep ${FAKETAG}| awk '{print $2}'`
 	ARCHES=`${KOJI} taginfo ${BUILDTAG} | grep Arches | cut -d ":" -f 2-`
+	[ -z "$ARCHES" ] && ARCHES="x86_64"
 	mash_prepare "${TAG}" "${LOG}" "${ARCHES}"
 	if [ ! -f $MASH_CACHE/$TAG.buildlist ]
 	then