diff --git a/qutebrowser/completion/completionwidget.py b/qutebrowser/completion/completionwidget.py
index a3bea931a..af31143c4 100644
--- a/qutebrowser/completion/completionwidget.py
+++ b/qutebrowser/completion/completionwidget.py
@@ -38,15 +38,13 @@ class CompletionView(QTreeView):
     Based on QTreeView but heavily customized so root elements show as category
     headers, and children show as flat list.
 
-    Class attributes:
-        COLUMN_WIDTHS: A list of column widths, in percent.
-
     Attributes:
         enabled: Whether showing the CompletionView is enabled.
         _win_id: The ID of the window this CompletionView is associated with.
         _height: The height to use for the CompletionView.
         _height_perc: Either None or a percentage if height should be relative.
         _delegate: The item delegate used.
+        column_widths: A list of column widths, in percent.
 
     Signals:
         resize_completion: Emitted when the completion should be resized.
@@ -82,7 +80,6 @@ class CompletionView(QTreeView):
             border: 0px;
         }
     """
-    COLUMN_WIDTHS = (20, 70, 10)
 
     # FIXME style scrollbar
     # https://github.com/The-Compiler/qutebrowser/issues/117
@@ -103,6 +100,8 @@ class CompletionView(QTreeView):
         # FIXME handle new aliases.
         # objreg.get('config').changed.connect(self.init_command_completion)
 
+        self.column_widths = config.get('completion',
+                                        'base-column-width-percentages')
         self._delegate = completiondelegate.CompletionItemDelegate(self)
         self.setItemDelegate(self._delegate)
         style.set_register_stylesheet(self)
@@ -128,9 +127,9 @@ class CompletionView(QTreeView):
         return utils.get_repr(self)
 
     def _resize_columns(self):
-        """Resize the completion columns based on COLUMN_WIDTHS."""
+        """Resize the completion columns based on column_widths."""
         width = self.size().width()
-        pixel_widths = [(width * perc // 100) for perc in self.COLUMN_WIDTHS]
+        pixel_widths = [(width * perc // 100) for perc in self.column_widths]
         if self.verticalScrollBar().isVisible():
             pixel_widths[-1] -= self.style().pixelMetric(
                 QStyle.PM_ScrollBarExtent) + 5
@@ -203,6 +202,10 @@ class CompletionView(QTreeView):
             sel_model.deleteLater()
         for i in range(model.rowCount()):
             self.expand(model.index(i, 0))
+
+        if model.column_widths:
+            self.column_widths = model.column_widths
+
         self._resize_columns()
         self.maybe_resize_completion()
 
diff --git a/qutebrowser/completion/models/base.py b/qutebrowser/completion/models/base.py
index 0d4bf7fca..9036df385 100644
--- a/qutebrowser/completion/models/base.py
+++ b/qutebrowser/completion/models/base.py
@@ -27,6 +27,7 @@ from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QStandardItemModel, QStandardItem
 
 from qutebrowser.utils import usertypes, qtutils
+from qutebrowser.config import config
 
 
 Role = usertypes.enum('Role', ['sort', 'userdata'], start=Qt.UserRole,
@@ -44,6 +45,8 @@ class BaseCompletionModel(QStandardItemModel):
     def __init__(self, parent=None):
         super().__init__(parent)
         self.setColumnCount(3)
+        self.column_widths = config.get('completion',
+                                        'base-column-width-percentages')
         self.columns_to_filter = [0]
 
     def new_category(self, name, sort=None):
diff --git a/qutebrowser/completion/models/sortfilter.py b/qutebrowser/completion/models/sortfilter.py
index 3c247a0a2..db4e8e425 100644
--- a/qutebrowser/completion/models/sortfilter.py
+++ b/qutebrowser/completion/models/sortfilter.py
@@ -53,6 +53,7 @@ class CompletionFilterModel(QSortFilterProxyModel):
         else:
             self.setSortRole(completion.Role.sort)
             self._sort_order = dumb_sort
+        self.column_widths = source.column_widths
 
     def set_pattern(self, val):
         """Setter for pattern.
diff --git a/qutebrowser/completion/models/urlmodel.py b/qutebrowser/completion/models/urlmodel.py
index 2da1d0b71..b33366f22 100644
--- a/qutebrowser/completion/models/urlmodel.py
+++ b/qutebrowser/completion/models/urlmodel.py
@@ -75,6 +75,8 @@ class UrlCompletionModel(base.BaseCompletionModel):
 
         objreg.get('config').changed.connect(self.reformat_timestamps)
 
+        self.column_widths = (40, 50, 10)
+
     def _fmt_atime(self, atime):
         """Format an atime to a human-readable string."""
         fmt = config.get('completion', 'timestamp-format')
diff --git a/qutebrowser/config/configdata.py b/qutebrowser/config/configdata.py
index 7a1f4f236..19dd18db2 100644
--- a/qutebrowser/config/configdata.py
+++ b/qutebrowser/config/configdata.py
@@ -398,6 +398,11 @@ def data(readonly=False):
              "Whether to shrink the completion to be smaller than the "
              "configured size if there are no scrollbars."),
 
+            ('base-column-width-percentages',
+             SettingValue(typ.IntList(), '20,70,10'),
+             "List of width percentages of the base completion columns."
+             "These can be overridden by child classes."),
+
             readonly=readonly
         )),