diff --git a/nixos/tests/snapper.nix b/nixos/tests/snapper.nix
index 651adc8934d3..674523584fda 100644
--- a/nixos/tests/snapper.nix
+++ b/nixos/tests/snapper.nix
@@ -15,7 +15,7 @@ import ./make-test-python.nix ({ ... }:
         fsType = "btrfs";
       };
     };
-    services.snapper.configs.home.subvolume = "/home";
+    services.snapper.configs.home.SUBVOLUME = "/home";
     services.snapper.filters = "/nix";
   };