diff --git a/deployment/function.nix b/deployment/function.nix
index 4f473107..d1a047f0 100644
--- a/deployment/function.nix
+++ b/deployment/function.nix
@@ -22,18 +22,16 @@ in
     function-type = mkOption {
       type = optionType;
       readOnly = true;
-      default = functionTo (
-        submodule (function: {
-          options = {
-            input = mkOption {
-              type = submodule config.input-type;
-            };
-            output = mkOption {
-              type = submodule config.output-type;
-            };
+      default = functionTo (submodule {
+        options = {
+          input = mkOption {
+            type = submodule config.input-type;
           };
-        })
-      );
+          output = mkOption {
+            type = submodule config.output-type;
+          };
+        };
+      });
     };
   };
 }