diff --git a/src/JS.php b/src/JS.php
index 597cfe2..83ba16a 100644
--- a/src/JS.php
+++ b/src/JS.php
@@ -247,7 +247,7 @@ protected function extractRegex()
                 $other->extractStrings('\'"`', "$count-");
                 $other->stripComments();
                 $match['before'] = $other->replace($match['before']);
-                $this->nestedExtracted += $other->extracted;
+                $minifier->nestedExtracted += $other->extracted;
             }
 
             return (isset($match['before']) ? $match['before'] : '').