diff --git a/hosts/common/programs/mercurial.nix b/hosts/common/programs/mercurial.nix
index 14db338aa..3ac82ab9b 100644
--- a/hosts/common/programs/mercurial.nix
+++ b/hosts/common/programs/mercurial.nix
@@ -1,6 +1,8 @@
-{ ... }:
+{ pkgs, ... }:
 {
   sane.programs.mercurial = {
+    packageUnwrapped = pkgs.mercurialFull;
+    sandbox.wrapperType = "inplace";  # etc/mercurial/hgrc refers to hg python-path (to define an extension)
     suggestedPrograms = [
       "less"  #< TODO: this might be a missing dependency on the nix side of things?
     ];