diff --git a/nixos-modules/genode-core.nix b/nixos-modules/genode-core.nix
index 15ef4a7..95855a6 100644
--- a/nixos-modules/genode-core.nix
+++ b/nixos-modules/genode-core.nix
@@ -344,6 +344,9 @@ in {
         { }) // {
           fs = {
             package = pkgs.genodePackages.vfs;
+            extraErisInputs =
+              lib.optional (config.genode.boot.storeBackend == "memory")
+              pkg.genodePackages.rump;
             configFile = let
               vfsConfig = if config.genode.boot.storeBackend == "memory" then ''
                 VFS.vfs