diff --git a/zipl/dracut/zipl_helper.prepare-ngdump b/zipl/dracut/zipl_helper.prepare-ngdump
index 92a27bc4..7fbdb2bc 100755
--- a/zipl/dracut/zipl_helper.prepare-ngdump
+++ b/zipl/dracut/zipl_helper.prepare-ngdump
@@ -19,7 +19,7 @@ DRACUT_OMIT_MODULES=(
 function create_dumpfs()
 {
 	[ "$dryrun" -eq 1 ] && { echo "/dev/null"; return 0; }
-	mkfs -F "$device" >/dev/null || { echo "Couldn't create filesystem on $1." >&2; return 1; }
+	mkfs.ext4 -F "$device" >/dev/null || { echo "Couldn't create filesystem on $1." >&2; return 1; }
 	local disk_path=/dev/disk/by-uuid/$(blkid -o value -s UUID "$device")
 	for i in $(seq 0 30)
 	do
diff --git a/zipl/initramfs-tools/zipl_helper.prepare-ngdump b/zipl/initramfs-tools/zipl_helper.prepare-ngdump
index 7d9a8570..e1221858 100755
--- a/zipl/initramfs-tools/zipl_helper.prepare-ngdump
+++ b/zipl/initramfs-tools/zipl_helper.prepare-ngdump
@@ -9,7 +9,7 @@
 function create_dumpfs()
 {
 	[ "$dryrun" -eq 1 ] && { echo "/dev/null"; return 0; }
-	mkfs -F "$device" >/dev/null || { echo "Couldn't create filesystem on $1." >&2; return 1; }
+	mkfs.ext4 -F "$device" >/dev/null || { echo "Couldn't create filesystem on $1." >&2; return 1; }
 	local disk_path=/dev/disk/by-uuid/$(blkid -o value -s UUID "$device")
 	for i in $(seq 0 30)
 	do