diff --git a/updater/include/updater/simulator_runtime.h b/updater/include/updater/simulator_runtime.h
index 9f7847b..fa878db 100644
--- a/updater/include/updater/simulator_runtime.h
+++ b/updater/include/updater/simulator_runtime.h
@@ -53,6 +53,7 @@
   bool MapPartitionOnDeviceMapper(const std::string& partition_name, std::string* path) override;
   bool UnmapPartitionOnDeviceMapper(const std::string& partition_name) override;
   bool UpdateDynamicPartitions(const std::string_view op_list_value) override;
+  std::string AddSlotSuffix(const std::string_view arg) const override;
 
  private:
   std::string FindBlockDeviceName(const std::string_view name) const override;
diff --git a/updater/include/updater/updater_runtime.h b/updater/include/updater/updater_runtime.h
index 8fc066f..b943dfc 100644
--- a/updater/include/updater/updater_runtime.h
+++ b/updater/include/updater/updater_runtime.h
@@ -56,6 +56,7 @@
   bool MapPartitionOnDeviceMapper(const std::string& partition_name, std::string* path) override;
   bool UnmapPartitionOnDeviceMapper(const std::string& partition_name) override;
   bool UpdateDynamicPartitions(const std::string_view op_list_value) override;
+  std::string AddSlotSuffix(const std::string_view arg) const override;
 
  private:
   struct selabel_handle* sehandle_{ nullptr };