diff --git a/src/nix/prefetch.cc b/src/nix/prefetch.cc
index b7da3ea5a..9c2309a5f 100644
--- a/src/nix/prefetch.cc
+++ b/src/nix/prefetch.cc
@@ -283,8 +283,6 @@ struct CmdStorePrefetchFile : StoreCommand, MixJSON
         expectArg("url", &url);
     }
 
-    Category category() override { return catUtility; }
-
     std::string description() override
     {
         return "download a file into the Nix store";