diff --git a/ops/nixos/lib/hgrc b/ops/nixos/lib/hgrc
index def481d0a9..458ebbfeca 100644
--- a/ops/nixos/lib/hgrc
+++ b/ops/nixos/lib/hgrc
@@ -55,3 +55,4 @@ amend =
 evolve =
 topic =
 hggit =
+purge =