diff --git a/fedora-build-opennebula-image.sh b/fedora-build-opennebula-image.sh
index b120dc6..4d22522 100755
--- a/fedora-build-opennebula-image.sh
+++ b/fedora-build-opennebula-image.sh
@@ -20,7 +20,7 @@ set -x
 # XXX: Handle command-line arguments?
 RELEASE=31
 ARCH=x86_64
-IMAGE_PATH=fedora-$RELEASE-$(date --iso-8601).img.qcow2
+IMAGE_PATH=fedora-$RELEASE-$(date +%+F).img.qcow2
 IMAGE_SIZE=10G
 NBD_DEVICE=/dev/nbd1