diff --git a/Orange/widgets/utils/domaineditor.py b/Orange/widgets/utils/domaineditor.py
index 3ce1d2ae2d9..7d6219eb6a9 100644
--- a/Orange/widgets/utils/domaineditor.py
+++ b/Orange/widgets/utils/domaineditor.py
@@ -300,8 +300,7 @@ def numbers_are_round(var, col_data):
                 var = orig_var
             elif tpe == type(orig_var):
                 # change the name so that all_vars will get the correct name
-                orig_var.name = name
-                var = orig_var
+                var = orig_var.copy(name=name)
             elif tpe == DiscreteVariable:
                 values = list(str(i) for i in unique(col_data) if not self._is_missing(i))
                 round_numbers = numbers_are_round(orig_var, col_data)