diff --git a/bin/pungi b/bin/pungi
index 221a79c0..0a45d178 100755
--- a/bin/pungi
+++ b/bin/pungi
@@ -331,6 +331,11 @@ if __name__ == '__main__':
             help='Which files are the release notes -- GPL EULA')
         parser.add_argument("--nomacboot", action="store_true", dest="nomacboot",
                             help='disable setting up macboot as no hfs support ')
+
+        parser.add_argument(
+            "--rootfs-size", dest="rootfs_size", action=SetConfig, default=False,
+            help='Size of root filesystem in GiB. If not specified, use lorax default value')
+
         parser.add_argument(
             "--pungirc", dest="pungirc", default='~/.pungirc', action=SetConfig,
             help='Read pungi options from config file ')
diff --git a/pungi/config.py b/pungi/config.py
index 7fd783e0..3c94739c 100644
--- a/pungi/config.py
+++ b/pungi/config.py
@@ -65,6 +65,7 @@ class Config(SafeConfigParser):
         self.set('pungi', 'resolve_deps', "True")
         self.set('pungi', 'no_dvd', "False")
         self.set('pungi', 'nomacboot', "False")
+        self.set('pungi', 'rootfs_size', "False")
 
         # if missing, self.read() is a noop, else change 'defaults'
         if pungirc:
diff --git a/pungi/gather.py b/pungi/gather.py
index 5034cbc7..6c152e58 100644
--- a/pungi/gather.py
+++ b/pungi/gather.py
@@ -138,8 +138,6 @@ class PungiBase(object):
                                     self.config.get('pungi', 'variant'),
                                     self.tree_arch)
 
-
-
     def doLoggerSetup(self):
         """Setup our logger"""
 
@@ -302,6 +300,9 @@ class Pungi(PungiBase):
 
         self.fulltree_excludes = set(self.ksparser.handler.fulltree_excludes)
 
+        # rootfs image size
+        self.rootfs_size = self.config.get('pungi', 'rootfs_size')
+
     def _add_yum_repo(self, name, url, mirrorlist=False, groups=True,
                       cost=1000, includepkgs=None, excludepkgs=None,
                       proxy=None):
@@ -1570,6 +1571,9 @@ class Pungi(PungiBase):
         except (ConfigParser.NoSectionError, ConfigParser.NoOptionError):
             pass
 
+        if self.rootfs_size != "False":
+            cmd.extend(["--rootfs-size", self.rootfs_size])
+
         # Allow the output directory to exist.
         cmd.append("--force")