diff --git a/lib/modules.nix b/lib/modules.nix
index cf44e3c66854..00d7605e9d9d 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -1038,7 +1038,7 @@ let
     : 2\. Function argument
   */
   mergeOptionDecls =
-    loc: opts:
+    loc:
     foldl'
       (
         res: opt:
@@ -1103,8 +1103,7 @@ let
         declarations = [ ];
         declarationPositions = [ ];
         options = [ ];
-      }
-      opts;
+      };
 
   /**
     Merge all the definitions of an option to produce the final