diff --git a/base/manifest-schema.json b/base/manifest-schema.json
index 21eb276..50780ad 100644
--- a/base/manifest-schema.json
+++ b/base/manifest-schema.json
@@ -13,7 +13,8 @@
                                 "image_file": { "type": "string" },
 				"tarball": { "type": "boolean" },
 				"tarball_dir": { "type": "string" },
-				"device" : { "type" : "string" }
+				"device" : { "type" : "string" },
+				"mirror":   { "type": "string" }
 			},
 			"required": ["mount_dir"]
 		},
@@ -30,8 +31,7 @@
 				},
 				"timezone": { "type": "string" },
 				"locale":   { "type": "string" },
-				"charmap":  { "type": "string" },
-				"mirror":   { "type": "string" }
+				"charmap":  { "type": "string" }
 			},
 			"required": ["release", "architecture", "timezone", "locale", "charmap"]
 		},
diff --git a/common/tasks/bootstrap.py b/common/tasks/bootstrap.py
index 775e715..a1f6ca0 100644
--- a/common/tasks/bootstrap.py
+++ b/common/tasks/bootstrap.py
@@ -13,8 +13,8 @@ def get_bootstrap_args(info):
 		options.append('--include=' + ','.join(include))
 	if len(exclude) > 0:
 		options.append('--exclude=' + ','.join(exclude))
-        if info.manifest.system['mirror']:
-		mirror =  info.manifest.system['mirror']
+        if info.manifest.bootstrapper['mirror']:
+		mirror =  info.manifest.bootstrapper['mirror']
 	else:
 		mirror = 'http://http.debian.net/debian'
 	arguments = [info.manifest.system['release'], info.root, mirror]
diff --git a/manifests/virtualbox.json b/manifests/virtualbox.json
index 481d5c5..238ef98 100644
--- a/manifests/virtualbox.json
+++ b/manifests/virtualbox.json
@@ -3,7 +3,8 @@
 	"virtualization": "ide",
 
 	"bootstrapper": {
-		"mount_dir": "/mnt/target"
+		"mount_dir": "/mnt/target",
+		"mirror"      : "http://ftp.fr.debian.org/debian/"
 	},
 	"image": {
 		"name"       : "debian-{release}-{architecture}-{virtualization}-{%y}{%m}{%d}",
@@ -14,8 +15,7 @@
 		"architecture": "amd64",
 		"timezone"    : "UTC",
 		"locale"      : "en_US",
-		"charmap"     : "UTF-8",
-		"mirror"      : "http://ftp.fr.debian.org/debian/"
+		"charmap"     : "UTF-8"
 	},
 	"volume": {
 		"backing"   : "raw",
@@ -32,6 +32,10 @@
 		"root_password": {
 			"enabled": true,
 			"password": "test"
-                }
+                },
+		"convert_image": {
+			"enabled": true,
+			"format": "vdi"
+		}
 	}
 }