diff --git a/scene/gui/file_dialog.cpp b/scene/gui/file_dialog.cpp
index b4dafd1736c..75e908126b8 100644
--- a/scene/gui/file_dialog.cpp
+++ b/scene/gui/file_dialog.cpp
@@ -798,12 +798,13 @@ void FileDialog::update_file_list() {
 	file_list->get_v_scroll_bar()->set_value(0);
 
 	if (display_mode == DISPLAY_THUMBNAILS) {
+		int thumbnail_size = theme_cache.thumbnail_size * get_theme_default_base_scale();
 		file_list->set_max_columns(0);
 		file_list->set_icon_mode(ItemList::ICON_MODE_TOP);
-		file_list->set_fixed_column_width(theme_cache.thumbnail_size * 3 / 2);
+		file_list->set_fixed_column_width(thumbnail_size * 3 / 2);
 		file_list->set_max_text_lines(2);
 		file_list->set_text_overrun_behavior(TextServer::OVERRUN_TRIM_ELLIPSIS);
-		file_list->set_fixed_icon_size(Size2(theme_cache.thumbnail_size, theme_cache.thumbnail_size));
+		file_list->set_fixed_icon_size(Size2(thumbnail_size, thumbnail_size));
 	} else {
 		file_list->set_icon_mode(ItemList::ICON_MODE_LEFT);
 		file_list->set_max_columns(1);