diff --git a/jedi/api.py b/jedi/api.py
index 126a1620..22bc4144 100644
--- a/jedi/api.py
+++ b/jedi/api.py
@@ -158,7 +158,7 @@ class Script(object):
                                                     len(like), s)
                     k = (new.word, new.complete)  # key
                     if k in comp_dct and settings.no_completion_duplicates:
-                        comp_dct[k].same_name_completions.append(new)
+                        comp_dct[k]._same_name_completions.append(new)
                     else:
                         comp_dct[k] = new
                         comps.append(new)
diff --git a/jedi/api_classes.py b/jedi/api_classes.py
index a4fefffe..14d00129 100644
--- a/jedi/api_classes.py
+++ b/jedi/api_classes.py
@@ -165,7 +165,7 @@ class Completion(BaseDefinition):
 
         # Completion objects with the same Completion name (which means
         # duplicate items in the completion)
-        self.same_name_completions = []
+        self._same_name_completions = []
 
         self._followed_definitions = None