diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 7b412d2dd..3758c730f 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -99,6 +99,8 @@ typedef std::map<StorePath, std::optional<ContentAddress>> StorePathCAMap;
 
 struct StoreConfig : public Config
 {
+    typedef std::map<std::string, std::string> Params;
+
     using Config::Config;
 
     StoreConfig() = delete;
@@ -153,10 +155,6 @@ struct StoreConfig : public Config
 
 class Store : public std::enable_shared_from_this<Store>, public virtual StoreConfig
 {
-public:
-
-    typedef std::map<std::string, std::string> Params;
-
 protected:
 
     struct PathInfoCacheValue {
diff --git a/src/libstore/uds-remote-store.hh b/src/libstore/uds-remote-store.hh
index 2bd6517fa..b9d9a39b5 100644
--- a/src/libstore/uds-remote-store.hh
+++ b/src/libstore/uds-remote-store.hh
@@ -9,7 +9,7 @@ namespace nix {
 
 struct UDSRemoteStoreConfig : virtual LocalFSStoreConfig, virtual RemoteStoreConfig
 {
-    UDSRemoteStoreConfig(const Store::Params & params)
+    UDSRemoteStoreConfig(const Params & params)
         : StoreConfig(params)
         , LocalFSStoreConfig(params)
         , RemoteStoreConfig(params)