diff --git a/nightly.sh b/nightly.sh
index 889fe0a..4485e91 100755
--- a/nightly.sh
+++ b/nightly.sh
@@ -155,7 +155,7 @@ do
   elif [ "$koji" = "ppc" ]; then
      arches=ppc64,ppc64le
   elif [ "$koji" = "s390" ]; then
-     arches=s390,s390x
+     arches=s390x
   fi
   ./releng/scripts/srpm-excluded-arch.py -a $arches --path $DESTDIR/compose/Everything/source/tree/Packages/ >$DESTDIR/logs/excludearch-$koji.log
 done