diff --git a/app/assets/javascripts/discourse/components/select-box.js.es6 b/app/assets/javascripts/discourse/components/select-box.js.es6
index 6f2d055aeb3..5e8b2323f51 100644
--- a/app/assets/javascripts/discourse/components/select-box.js.es6
+++ b/app/assets/javascripts/discourse/components/select-box.js.es6
@@ -104,6 +104,8 @@ export default Ember.Component.extend({
       const relativeLeft = this.$().offset().left - $(window).scrollLeft();
       options.left = margin - relativeLeft;
       options.width = windowWidth - margin * 2;
+      options.maxWidth = "auto";
+      options.minWidth = "auto";
     } else {
       const offsetLeft = boundingRect.left;
       const bodyWidth = this.$(".select-box-body").outerWidth(false);