diff --git a/lib_standalone/Preferences.h b/lib_standalone/Preferences.h
index a5372c338..eb365246e 100644
--- a/lib_standalone/Preferences.h
+++ b/lib_standalone/Preferences.h
@@ -19,6 +19,9 @@ class Preferences {
         return true;
     }
 
+    void end() {
+    }
+
     bool remove(const char * key) {
         return true;
     }