diff --git a/python/plugins/processing/algs/gdal/translate.py b/python/plugins/processing/algs/gdal/translate.py
index c5bf87a5f93..6c444026a41 100644
--- a/python/plugins/processing/algs/gdal/translate.py
+++ b/python/plugins/processing/algs/gdal/translate.py
@@ -80,11 +80,11 @@ class translate(GdalAlgorithm):
                                           self.tr("Nodata value, leave blank to take the nodata value from input"),
                                           '', optional=True))
         self.addParameter(ParameterSelection(self.EXPAND,
-                                             self.tr('Expand'), ['none', 'gray', 'rgb', 'rgba']))
+                                             self.tr('Expand'), ['none', 'gray', 'rgb', 'rgba'], default=0))
         self.addParameter(ParameterCrs(self.SRS,
                                        self.tr('Output projection for output file [leave blank to use input projection]'), None, optional=True))
         self.addParameter(ParameterExtent(self.PROJWIN,
-                                          self.tr('Subset based on georeferenced coordinates')))
+                                          self.tr('Subset based on georeferenced coordinates')), optional=True)
         self.addParameter(ParameterBoolean(self.SDS,
                                            self.tr('Copy all subdatasets of this file to individual output files'),
                                            False))