diff --git a/nix/workbench/default.nix b/nix/workbench/default.nix
index 9cec39727de..b4c9da803a5 100644
--- a/nix/workbench/default.nix
+++ b/nix/workbench/default.nix
@@ -104,10 +104,7 @@ let
       profileNix = ps.value."${profileName}"
         or (throw "No such profile: ${profileName};  Known profiles: ${toString (__attrNames ps.value)}");
 
-      profile = materialise-profile
-        { inherit profileNix;
-          backendProfile = backend.materialise-profile { inherit profileNix; };
-        };
+      profile = materialise-profile { inherit profileNix backend; };
 
       topology = profile-topology { inherit profileNix profile; };
 
diff --git a/nix/workbench/profile.nix b/nix/workbench/profile.nix
index 74374543169..444fe91f651 100644
--- a/nix/workbench/profile.nix
+++ b/nix/workbench/profile.nix
@@ -2,10 +2,11 @@
 with lib;
 
 { profileNix
-, backendProfile ## Backend-specific results for forwarding
+, backend ## Backend-specifics for forwarding
 }:
 pkgs.runCommand "workbench-profile-output-${profileNix.name}"
   { buildInputs = [];
+    backendConfigPath = backend.materialise-profile { inherit profileNix; };
     nodeServices =
       __toJSON
       (flip mapAttrs profileNix.node-services
@@ -40,7 +41,7 @@ pkgs.runCommand "workbench-profile-output-${profileNix.name}"
   mkdir $out
   cp    ${profileNix.JSON}            $out/profile.json
   cp    ${profileNix.node-specs.JSON} $out/node-specs.json
-  cp    ${backendProfile}/*           $out
+  cp    $backendConfigPath/*          $out
   cp    $nodeServicesPath             $out/node-services.json
   cp    $generatorServicePath         $out/generator-service.json
   cp    $tracerServicePath            $out/tracer-service.json