diff --git a/src/libstore/local-overlay-store.cc b/src/libstore/local-overlay-store.cc
index 061478c52..ddccb8c5a 100644
--- a/src/libstore/local-overlay-store.cc
+++ b/src/libstore/local-overlay-store.cc
@@ -176,44 +176,6 @@ void LocalOverlayStore::registerValidPaths(const ValidPathInfos & infos)
 }
 
 
-void LocalOverlayStore::addToStore(const ValidPathInfo & info, Source & source,
-    RepairFlag repair, CheckSigsFlag checkSigs)
-{
-    LocalStore::addToStore(info, source, repair, checkSigs);
-    if (lowerStore->isValidPath(info.path)) {
-        // dedup stores
-        deletePath(toUpperPath(info.path));  // TODO: Investigate whether this can trigger 'stale file handle' errors.
-    }
-}
-
-
-StorePath LocalOverlayStore::addToStoreFromDump(Source & dump, std::string_view name,
-    FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references)
-{
-    auto path = LocalStore::addToStoreFromDump(dump, name, method, hashAlgo, repair, references);
-    if (lowerStore->isValidPath(path)) {
-        // dedup stores
-        deletePath(toUpperPath(path));
-    }
-    return path;
-}
-
-
-StorePath LocalOverlayStore::addTextToStore(
-    std::string_view name,
-    std::string_view s,
-    const StorePathSet & references,
-    RepairFlag repair)
-{
-    auto path = LocalStore::addTextToStore(name, s, references, repair);
-    if (lowerStore->isValidPath(path)) {
-        // dedup stores
-        deletePath(toUpperPath(path));
-    }
-    return path;
-}
-
-
 void LocalOverlayStore::deleteGCPath(const Path & path, uint64_t & bytesFreed)
 {
     auto mergedDir = realStoreDir.get() + "/";
diff --git a/src/libstore/local-overlay-store.hh b/src/libstore/local-overlay-store.hh
index 701024bfb..e6b877b04 100644
--- a/src/libstore/local-overlay-store.hh
+++ b/src/libstore/local-overlay-store.hh
@@ -108,18 +108,6 @@ private:
 
     void registerValidPaths(const ValidPathInfos & infos) override;
 
-    void addToStore(const ValidPathInfo & info, Source & source,
-        RepairFlag repair, CheckSigsFlag checkSigs) override;
-
-    StorePath addToStoreFromDump(Source & dump, std::string_view name,
-        FileIngestionMethod method, HashType hashAlgo, RepairFlag repair, const StorePathSet & references) override;
-
-    StorePath addTextToStore(
-        std::string_view name,
-        std::string_view s,
-        const StorePathSet & references,
-        RepairFlag repair) override;
-
     void queryRealisationUncached(const DrvOutput&,
         Callback<std::shared_ptr<const Realisation>> callback) noexcept override;