diff --git a/Orange/widgets/utils/domaineditor.py b/Orange/widgets/utils/domaineditor.py
index abd0f3a9fb7..21db7fa3c9b 100644
--- a/Orange/widgets/utils/domaineditor.py
+++ b/Orange/widgets/utils/domaineditor.py
@@ -4,7 +4,7 @@
 import scipy.sparse as sp
 
 from AnyQt.QtCore import Qt, QAbstractTableModel
-from AnyQt.QtGui import QColor
+from AnyQt.QtGui import QColor, QFont
 from AnyQt.QtWidgets import QComboBox, QTableView, QSizePolicy
 
 from Orange.data import DiscreteVariable, ContinuousVariable, StringVariable, \
@@ -43,6 +43,10 @@ class VarTableModel(QAbstractTableModel):
     def __init__(self, variables, *args):
         super().__init__(*args)
         self.variables = variables
+        self.orig_variables = variables.copy()
+
+    def set_orig_variables(self, variables):
+        self.orig_variables = variables.copy()
 
     def set_variables(self, variables):
         self.modelAboutToBeReset.emit()
@@ -76,6 +80,11 @@ def data(self, index, role):
             place = self.variables[row][Column.place]
             mapping = [Place.meta, Place.feature, Place.class_var, None]
             return TableModel.ColorForRole.get(mapping[place], None)
+        if role == Qt.FontRole:
+            if self.variables[row] != self.orig_variables[row]:
+                font = QFont()
+                font.setBold(True)
+                return font
 
     def setData(self, index, value, role):
         row, col = index.row(), index.column()
@@ -342,6 +351,7 @@ def _get_column(self, data, source_var, source_place):
 
     def set_domain(self, domain):
         self.variables = self.parse_domain(domain)
+        self.model().set_orig_variables(self.variables)
 
     @staticmethod
     def parse_domain(domain):