diff --git a/flake.nix b/flake.nix
index 78aa659..ad0b587 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,7 +20,15 @@
       });
     });
     in rec {
-      packages.home-assistant-controller = pkgs.haskell.lib.justStaticExecutables hp.home-assistant-controller;
+      packages.home-assistant-controller = pkgs.symlinkJoin {
+        name = "home-assistant-controller";
+        paths = [ (pkgs.haskell.lib.justStaticExecutables hp.home-assistant-controller) ];
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+        postBuild = ''
+          wrapProgram $out/bin/home-assistant-controller \
+            --set HA_RRDTOOL ${pkgs.lib.getBin pkgs.rrdtool}/bin/rrdtool
+        '';
+      };
       defaultPackage = packages.home-assistant-controller;
       devShell = hp.shellFor {
         packages = h: [h.home-assistant-controller];
@@ -34,6 +42,8 @@
           hp.graphmod
 
           hp.haskell-language-server
+
+          rrdtool
         ];
       };
     }