diff --git a/python/plugins/processing/gui/wrappers.py b/python/plugins/processing/gui/wrappers.py
index f9b4bca4545..92491c28b43 100644
--- a/python/plugins/processing/gui/wrappers.py
+++ b/python/plugins/processing/gui/wrappers.py
@@ -36,7 +36,7 @@ from functools import cmp_to_key
 
 from qgis.core import QgsCoordinateReferenceSystem, QgsVectorLayer
 from qgis.PyQt.QtWidgets import QCheckBox, QComboBox, QLineEdit, QPlainTextEdit
-from qgis.gui import QgsFieldExpressionWidget
+from qgis.gui import QgsFieldExpressionWidget, QgsExpressionLineEdit
 from qgis.PyQt.QtCore import pyqtSignal, QObject, QVariant
 
 from processing.gui.NumberInputPanel import NumberInputPanel
@@ -714,7 +714,10 @@ class ExpressionWidgetWrapper(WidgetWrapper):
 
     def createWidget(self):
         if self.dialogType in (DIALOG_STANDARD, DIALOG_BATCH):
-            widget = QgsFieldExpressionWidget()
+            if self.param.parent_layer:
+                widget = QgsFieldExpressionWidget()
+            else:
+                widget = QgsExpressionLineEdit()
             if self.param.default:
                 widget.setExpression(self.param.default)
         else:
diff --git a/python/plugins/processing/modeler/ModelerParameterDefinitionDialog.py b/python/plugins/processing/modeler/ModelerParameterDefinitionDialog.py
index 08b3c51ac56..93dc8b727d6 100644
--- a/python/plugins/processing/modeler/ModelerParameterDefinitionDialog.py
+++ b/python/plugins/processing/modeler/ModelerParameterDefinitionDialog.py
@@ -210,7 +210,8 @@ class ModelerParameterDefinitionDialog(QDialog):
 
             self.verticalLayout.addWidget(QLabel(self.tr('Parent layer')))
             self.parentCombo = QComboBox()
-            idx = 0
+            self.parentCombo.addItem(self.tr("None"), None)
+            idx = 1
             for param in list(self.alg.inputs.values()):
                 if isinstance(param.param, (ParameterVector, ParameterTable)):
                     self.parentCombo.addItem(param.param.description, param.param.name)