diff --git a/src/easy/easy.hpp b/src/easy/easy.hpp
index 4f16409..0962401 100644
--- a/src/easy/easy.hpp
+++ b/src/easy/easy.hpp
@@ -312,8 +312,8 @@ public:
      *  @since  0.21.0
      */
     const return_entity_vector get_notifications(const uint16_t limit = 20,
-                                                 const string since_id = 0,
-                                                 const string max_id = 0);
+                                                 const string since_id = "",
+                                                 const string max_id = "");
 
     /*!
      *  @brief  Base class for all entities.