diff --git a/lix/libcmd/built-path.cc b/lix/libcmd/built-path.cc
index 77f4f98a1..0c4d481b7 100644
--- a/lix/libcmd/built-path.cc
+++ b/lix/libcmd/built-path.cc
@@ -23,10 +23,6 @@ namespace nix {
     CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, !=) \
     CMP_ONE(CHILD_TYPE, MY_TYPE, FIELD, <)
 
-#define FIELD_TYPE std::pair<std::string, StorePath>
-CMP(SingleBuiltPath, SingleBuiltPathBuilt, output)
-#undef FIELD_TYPE
-
 #define FIELD_TYPE std::map<std::string, StorePath>
 CMP(SingleBuiltPath, BuiltPathBuilt, outputs)
 #undef FIELD_TYPE
@@ -61,36 +57,6 @@ try {
     co_return result::current_exception();
 }
 
-kj::Promise<Result<JSON>> SingleBuiltPath::Built::toJSON(const Store & store) const
-try {
-    JSON res;
-    res["drvPath"] = TRY_AWAIT(drvPath->toJSON(store));
-    auto & [outputName, outputPath] = output;
-    res["output"] = outputName;
-    res["outputPath"] = store.printStorePath(outputPath);
-    co_return res;
-} catch (...) {
-    co_return result::current_exception();
-}
-
-kj::Promise<Result<JSON>> SingleBuiltPath::toJSON(const Store & store) const
-try {
-    co_return TRY_AWAIT(std::visit([&](const auto & buildable) {
-        return buildable.toJSON(store);
-    }, raw()));
-} catch (...) {
-    co_return result::current_exception();
-}
-
-
-kj::Promise<Result<JSON>> BuiltPath::toJSON(const Store & store) const
-try {
-    co_return TRY_AWAIT(std::visit([&](const auto & buildable) {
-        return buildable.toJSON(store);
-    }, raw()));
-} catch (...) {
-    co_return result::current_exception();
-}
 
 kj::Promise<Result<RealisedPath::Set>> BuiltPath::toRealisedPaths(Store & store) const
 try {
diff --git a/lix/libcmd/built-path.hh b/lix/libcmd/built-path.hh
index c9077e490..cfc8673d8 100644
--- a/lix/libcmd/built-path.hh
+++ b/lix/libcmd/built-path.hh
@@ -7,46 +7,6 @@
 
 namespace nix {
 
-struct SingleBuiltPath;
-
-struct SingleBuiltPathBuilt {
-    ref<DerivedPathOpaque> drvPath;
-    std::pair<std::string, StorePath> output;
-
-    std::string to_string(const Store & store) const;
-    static SingleBuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
-    kj::Promise<Result<JSON>> toJSON(const Store & store) const;
-
-    DECLARE_CMP(SingleBuiltPathBuilt);
-};
-
-namespace built_path::detail {
-using SingleBuiltPathRaw = std::variant<
-    DerivedPathOpaque,
-    SingleBuiltPathBuilt
->;
-}
-
-struct SingleBuiltPath : built_path::detail::SingleBuiltPathRaw {
-    using Raw = built_path::detail::SingleBuiltPathRaw;
-    using Raw::Raw;
-
-    using Opaque = DerivedPathOpaque;
-    using Built = SingleBuiltPathBuilt;
-
-    inline const Raw & raw() const {
-        return static_cast<const Raw &>(*this);
-    }
-
-    static SingleBuiltPath parse(const Store & store, std::string_view);
-    kj::Promise<Result<JSON>> toJSON(const Store & store) const;
-};
-
-static inline ref<SingleBuiltPath> staticDrv(StorePath drvPath)
-{
-    return make_ref<SingleBuiltPath>(SingleBuiltPath::Opaque { drvPath });
-}
-
 /**
  * A built derived path with hints in the form of optional concrete output paths.
  *
@@ -56,8 +16,6 @@ struct BuiltPathBuilt {
     DerivedPathOpaque drvPath;
     std::map<std::string, StorePath> outputs;
 
-    std::string to_string(const Store & store) const;
-    static BuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
     kj::Promise<Result<JSON>> toJSON(const Store & store) const;
 
     DECLARE_CMP(BuiltPathBuilt);
@@ -87,8 +45,6 @@ struct BuiltPath : built_path::detail::BuiltPathRaw {
 
     StorePathSet outPaths() const;
     kj::Promise<Result<RealisedPath::Set>> toRealisedPaths(Store & store) const;
-
-    kj::Promise<Result<JSON>> toJSON(const Store & store) const;
 };
 
 typedef std::vector<BuiltPath> BuiltPaths;