diff --git a/src/db/plugins/SimpleDatabasePlugin.hxx b/src/db/plugins/SimpleDatabasePlugin.hxx
index 80bc6f0ee..d998d5ac2 100644
--- a/src/db/plugins/SimpleDatabasePlugin.hxx
+++ b/src/db/plugins/SimpleDatabasePlugin.hxx
@@ -100,7 +100,7 @@ public:
 		return mtime;
 	}
 
-protected:
+private:
 	bool Configure(const config_param &param, Error &error);
 
 	gcc_pure