diff --git a/modules/tabbarDNDObserver.js b/modules/tabbarDNDObserver.js
index d2df629c..9d2bf9dc 100644
--- a/modules/tabbarDNDObserver.js
+++ b/modules/tabbarDNDObserver.js
@@ -694,18 +694,24 @@ catch(e) {
 		if (tabsInfo.draggedTabs.length <= 1)
 			return;
 
+/*
 		if (
 			'MultipleTabService' in w &&
 			'isSelected' in w.MultipleTabService &&
-			'setSelection' in w.MultipleTabService &&
+			'getSelectedTabs' in w.MultipleTabService &&
 			'clearSelection' in w.MultipleTabService &&
-			!w.MultipleTabService.isSelected(aTab)
+			'setSelection' in w.MultipleTabService &&
+			(
+				!w.MultipleTabService.isSelected(aTab) ||
+				w.MultipleTabService.getSelectedTabs(sv.browser) == [aTab]
+			)
 			) {
 			w.MultipleTabService.clearSelection(sv.browser);
 			tabsInfo.draggedTabs.forEach(function(aTab) {
 				w.MultipleTabService.setSelection(aTab, true);
 			});
 		}
+*/
 
 		w['piro.sakura.ne.jp'].tabsDragUtils.startTabsDrag(aEvent, tabsInfo.draggedTabs);
 	},