diff --git a/booru_viewer/gui/settings.py b/booru_viewer/gui/settings.py
index 744e00c..66fa3c8 100644
--- a/booru_viewer/gui/settings.py
+++ b/booru_viewer/gui/settings.py
@@ -136,7 +136,7 @@ class SettingsDialog(QDialog):
 
         # Thumbnail size
         self._thumb_size = QSpinBox()
-        self._thumb_size.setRange(100, 400)
+        self._thumb_size.setRange(100, 200)
         self._thumb_size.setSingleStep(20)
         self._thumb_size.setValue(self._db.get_setting_int("thumbnail_size"))
         form.addRow("Thumbnail size (px):", self._spinbox_row(self._thumb_size))