diff --git a/lib/inventory/build-inventory/default.nix b/lib/inventory/build-inventory/default.nix
index 008a662a2..70a13a72b 100644
--- a/lib/inventory/build-inventory/default.nix
+++ b/lib/inventory/build-inventory/default.nix
@@ -98,7 +98,7 @@ let
             roleModules = builtins.map (
               role:
               let
-                path = "${clan-core.clanModules.${serviceName}}/roles/${role}.nix";
+                path = clan-core.clanModules.${serviceName} + "/roles/${role}.nix";
               in
               if builtins.pathExists path then
                 path