diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index e1d4876b..7a8d737e 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -1896,7 +1896,7 @@ TreeStyleTabBrowser.prototype = {
 	{
 		if (
 			!window.__SS_tabsToRestore ||
-			this.getTreePref('restoreTreeOnStartup')
+			!this.getTreePref('restoreTreeOnStartup')
 			)
 			return;