diff --git a/git-hooks/gerrit-bot b/git-hooks/gerrit-bot
index bdd64b1eec0ec8e5afb16119db7b3ec5887c70d5..918b3fe4acb0feb83a5d1499f28604202fb22a23 100755
--- a/git-hooks/gerrit-bot
+++ b/git-hooks/gerrit-bot
@@ -128,7 +128,7 @@ sub process_commit($$$$$)
         chomp(@mainlines = `git config remote.origin.fetch`);
         $skipfetch{$project} = 1;
       }
-      if (system("git", "fetch", "-f", "origin", $ref.":refs/changes/".$number, @mainlines)) {
+      if (system("git", "fetch", "-f", "--prune", "origin", $ref.":refs/changes/".$number, @mainlines)) {
         printerr "GIT fetch of ".$ref." from ".$project." failed";
         return;
       }