diff --git a/bin/is b/bin/is
index f1b379e5189c9b88e78617b4f5c53e6fc4203c76..325d8b680a0312d7d3358b5895aa184357d234dd 100755
--- a/bin/is
+++ b/bin/is
@@ -235,7 +235,7 @@ def c_clean(args):
     '''
     repoman = load_repositories(args)
     for reponame in args.repository:
-        repoman[reponame].clean()
+        repoman[reponame].clean(args.force)
 
 def c_copy(args):
     '''
@@ -542,6 +542,8 @@ def arg_parser_init():
     p.set_defaults(func=c_chroot)
     # clean command parser
     p = subparser.add_parser("clean", help=c_clean.__doc__.lower())
+    p.add_argument("-f", "--force", action="store_true",
+                   help="clean repository without confirmation")
     p.add_argument("repository", nargs="+", help="repositories to clean")
     p.set_defaults(func=c_clean)
     # copy command parser
diff --git a/completion/bash/is b/completion/bash/is
index ac8fe27a014455c9eb312b8043557a351a1e1c39..f981c915cc27bf4263a3bbf30d53be8dab698aa8 100644
--- a/completion/bash/is
+++ b/completion/bash/is
@@ -91,7 +91,7 @@ _is() {
          _filedir -d
       ;;
       clean)
-         [[ "$cur" == -* ]] && _opt '-h --help' && return 0
+         [[ "$cur" == -* ]] && _opt '-h --help -f --force' && return 0
          _local_repo
       ;;
       copy)
diff --git a/installsystems/repository.py b/installsystems/repository.py
index 84ef4f2eba860aac29bece6a0fc971c510650e5c..d676a6c0ee7b9acebb790bdb190a770c23c80409 100644
--- a/installsystems/repository.py
+++ b/installsystems/repository.py
@@ -275,7 +275,7 @@ class Repository(object):
             if fo.md5 != f:
                 out(f)
 
-    def clean(self):
+    def clean(self, force=False):
         '''
         Clean the repository's content
         '''
@@ -291,7 +291,7 @@ class Repository(object):
             for f in dirtyfiles:
                 arrow(f, 1)
             # ask confirmation
-            if not confirm("Remove dirty files? (yes) "):
+            if not force and not confirm("Remove dirty files? (yes) "):
                 raise Exception("Aborted!")
             # start cleaning
             arrow("Cleaning")