diff --git a/git-sweep b/git-sweep
index 6765601..f80c4ba 100755
--- a/git-sweep
+++ b/git-sweep
@@ -66,7 +66,7 @@ def git(arguments, path):
 
 def fetch(remote, path):
     """Download objects and refs from remote repository."""
-    git(['fetch', remote], path=path)
+    git(['fetch', '--prune', remote], path=path)
 
 
 def remote_heads(remote, path):