diff --git a/deployment/data-model.nix b/deployment/data-model.nix
index c6fcfbd4..acd52b66 100644
--- a/deployment/data-model.nix
+++ b/deployment/data-model.nix
@@ -115,7 +115,7 @@ in
               default = {
                 input-type = submodule application.config.module;
                 output-type = application-resources;
-                implementation = application.config.implementation;
+                declare = application.config.implementation;
               };
             };
           };
@@ -152,7 +152,7 @@ in
               default = {
                 input-type = application-resources;
                 output-type = nixops4Deployment;
-                implementation = environment.config.implementation;
+                declare = environment.config.implementation;
               };
             };
             config-mapping = mkOption {
@@ -162,7 +162,7 @@ in
               default = {
                 input-type = config.configuration;
                 output-type = nixops4Deployment;
-                implementation =
+                declare =
                   cfg:
                   # TODO: check cfg.enable.true
                   let
diff --git a/deployment/function.nix b/deployment/function.nix
index 76795e68..3859cd7a 100644
--- a/deployment/function.nix
+++ b/deployment/function.nix
@@ -37,7 +37,7 @@ in
         };
       });
     };
-    implementation = mkOption {
+    declare = mkOption {
       type = config.function-type;
       default = _: { };
     };