diff --git a/scripts/mkimage b/scripts/mkimage
index b545ac7162..908245f7fd 100755
--- a/scripts/mkimage
+++ b/scripts/mkimage
@@ -307,7 +307,7 @@ if [ "${PROJECT}" = "Generic" ]; then
   qemu-img convert -O vmdk -o subformat=streamOptimized "${DISK_BASENAME}.tmp" "${DISK_BASENAME}.vmdk"
   # generate ovf from template
   sed -e "s,@DISTRO@,${DISTRO},g" -e "s,@DISK@,${IMAGE_NAME},g" \
-      -e "s,@DISK_SIZE@,$((${DISK_SIZE}*1024*1024)),g" \
+      -e "s,@OVA_SIZE@,$(($OVA_SIZE*1024*1024)),g" \
       "${PROJECT_DIR}/${PROJECT}/config/ovf.template" > "${DISK_BASENAME}.ovf"
   # combine ovf and vmdk into official ova
   tar -C "${TARGET_IMG}" -cf "${DISK_BASENAME}.ova" "${IMAGE_NAME}.ovf" "${IMAGE_NAME}.vmdk"