diff --git a/build_library/vm_image_util.sh b/build_library/vm_image_util.sh
index 3955d6a8a3..b1849ec44e 100644
--- a/build_library/vm_image_util.sh
+++ b/build_library/vm_image_util.sh
@@ -20,6 +20,7 @@ VALID_IMG_TYPES=(
     rackspace_vhd
     vagrant
     vagrant_parallels
+    vagrant_virtualbox
     vagrant_vmware_fusion
     virtualbox
     vmware