diff --git a/modules/browser.js b/modules/browser.js
index 78ef9a49..a352645a 100644
--- a/modules/browser.js
+++ b/modules/browser.js
@@ -5762,8 +5762,7 @@ TreeStyleTabBrowser.prototype = inherit(TreeStyleTabWindow.prototype, {
 			insertBefore = this.getNextSiblingTab(this.getRootTab(aTab));
 		}
 
-		if (aInfo.behavior == this.kCLOSE_PARENT_BEHAVIOR_REPLACE_WITH_GROUP_TAB &&
-			!this.isGroupTab(aTab)) {
+		if (aInfo.behavior == this.kCLOSE_PARENT_BEHAVIOR_REPLACE_WITH_GROUP_TAB) {
 			let uri = this.getGroupTabURI({
 				title:     aTab.label,
 				temporary: true