diff --git a/src/calibre/gui2/metadata/config.py b/src/calibre/gui2/metadata/config.py
index 846c360432..039579f029 100644
--- a/src/calibre/gui2/metadata/config.py
+++ b/src/calibre/gui2/metadata/config.py
@@ -96,6 +96,7 @@ class ConfigWidget(QWidget):
         if opt.type == 'number':
             c = QSpinBox if isinstance(opt.default, numbers.Integral) else QDoubleSpinBox
             widget = c(self)
+            widget.setRange(min(widget.minimum(), 20 * val), max(widget.maximum(), 20 * val))
             widget.setValue(val)
         elif opt.type == 'string':
             widget = QLineEdit(self)