diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index 6da27baf..4d9a7e27 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -636,8 +636,8 @@ var TreeStyleTabService = {
 				'{ TreeStyleTabService.onPrintPreviewEnter();'
 			));
 			eval('PrintUtils.exitPrintPreview = '+PrintUtils.exitPrintPreview.toSource().replace(
-				/(\}\)?)$/,
-				'TreeStyleTabService.onPrintPreviewExit(); $1'
+				'{',
+				'{ TreeStyleTabService.onPrintPreviewExit();'
 			));
 		}