diff --git a/python/plugins/processing/algs/qgis/ui/InterpolationWidgets.py b/python/plugins/processing/algs/qgis/ui/InterpolationWidgets.py
index 073ec543567..408e0441fc8 100644
--- a/python/plugins/processing/algs/qgis/ui/InterpolationWidgets.py
+++ b/python/plugins/processing/algs/qgis/ui/InterpolationWidgets.py
@@ -30,10 +30,8 @@ import os
 from qgis.PyQt import uic
 from qgis.PyQt.QtCore import pyqtSignal
 from qgis.PyQt.QtWidgets import (QTreeWidgetItem,
-                                 QComboBox
-                                 )
+                                 QComboBox)
 from qgis.core import (QgsApplication,
-                       QgsMapLayer,
                        QgsMapLayerProxyModel,
                        QgsWkbTypes,
                        QgsRectangle,
@@ -41,9 +39,9 @@ from qgis.core import (QgsApplication,
                        QgsCoordinateReferenceSystem,
                        QgsProcessingUtils,
                        QgsProcessingParameterNumber,
-                       QgsProcessingParameterDefinition
-                       )
-from qgis.core import QgsFieldProxyModel
+                       QgsProcessingParameterDefinition,
+                       QgsFieldProxyModel)
+from qgis.gui import QgsDoubleSpinBox
 from qgis.analysis import QgsInterpolator
 
 from processing.gui.wrappers import WidgetWrapper, DIALOG_STANDARD