diff --git a/select2.js b/select2.js
index 91892eee..9a927dc4 100644
--- a/select2.js
+++ b/select2.js
@@ -1390,7 +1390,7 @@ the specific language governing permissions and limitations under the Apache Lic
             var that = this;
             this.container.parents().add(window).each(function () {
                 $(this).on(resize+" "+scroll+" "+orient, function (e) {
-                    that.positionDropdown();
+                    if (!that.opened()) that.positionDropdown();
                 });
             });