diff --git a/modules/btrbk/README.md b/modules/btrbk/README.md
index 86aa3bb..a149da0 100644
--- a/modules/btrbk/README.md
+++ b/modules/btrbk/README.md
@@ -330,7 +330,6 @@ sudo btrbk -c ~/btrbk.cfg list
 { config, pkgs, ... }:
 {
   services.btrbk = {
-    extraPackages = [ pkgs.lz4 ];
     # Lowest scheduling priority.
     niceness = 19;
     # Set of btrbk instances. The instance named btrbk is the default one.
diff --git a/modules/btrbk/default.nix b/modules/btrbk/default.nix
index 18c3b63..268f262 100644
--- a/modules/btrbk/default.nix
+++ b/modules/btrbk/default.nix
@@ -18,9 +18,6 @@
   ];
 
   services.btrbk = {
-    # Transport compression with `lz4`,
-    # see `./backup.nix`.
-    extraPackages = [ pkgs.lz4 ];
     # Lowest scheduling priority.
     niceness = 19;
     # The `instances` option is set by `./snapshot.nix` and `./backup.nix`.