diff --git a/flatten_json.py b/flatten_json.py
index 9c7b68c..922ba4c 100644
--- a/flatten_json.py
+++ b/flatten_json.py
@@ -335,7 +335,7 @@ def _unflatten(dic, keys, value):
     list_keys = sorted(flat_dict.keys())
     for i, item in enumerate(list_keys):
         if i != len(list_keys) - 1:
-            if not list_keys[i + 1].startswith(list_keys[i]):
+            if not list_keys[i + 1].startswith(list_keys[i]+'.'):
                 _unflatten(unflattened_dict, item.split(separator),
                            flat_dict[item])
             else: