diff --git a/property_store.h b/property_store.h
index f3c0b2e..54c8056 100644
--- a/property_store.h
+++ b/property_store.h
@@ -156,6 +156,8 @@
                                      const RpcIdentifiersAccessor &accessor);
   void RegisterDerivedString(const std::string &name,
                              const StringAccessor &accessor);
+  void RegisterDerivedStringmap(const std::string &name,
+                                const StringmapAccessor &accessor);
   void RegisterDerivedStringmaps(const std::string &name,
                                  const StringmapsAccessor &accessor);
   void RegisterDerivedStrings(const std::string &name,