diff --git a/tinydb/table.py b/tinydb/table.py
index 17a0fb60..f91c6c41 100644
--- a/tinydb/table.py
+++ b/tinydb/table.py
@@ -726,7 +726,7 @@ def _get_next_id(self):
         # If we already know the next ID
         if self._next_id is not None:
             next_id = self._next_id
-            self._next_id = next_id + 1
+            self._next_id = next_id + 2
 
             return next_id