diff --git a/nixos/modules/services/monitoring/graphite.nix b/nixos/modules/services/monitoring/graphite.nix
index 08e6ef662cc..61aa30e57e1 100644
--- a/nixos/modules/services/monitoring/graphite.nix
+++ b/nixos/modules/services/monitoring/graphite.nix
@@ -15,6 +15,7 @@ let
     PYTHONPATH = "${pkgs.python27Packages.carbon}/lib/python2.7/site-packages";
     GRAPHITE_ROOT = dataDir;
     GRAPHITE_CONF_DIR = "/etc/graphite/";
+    GRAPHITE_STORAGE_DIR = dataDir;
   };
 
 in {