diff --git a/src/NodeComparator.php b/src/NodeComparator.php
index c7afe6f..cb48021 100644
--- a/src/NodeComparator.php
+++ b/src/NodeComparator.php
@@ -20,7 +20,6 @@
 use DOMNotation;
 use DOMProcessingInstruction;
 use DOMXPath;
-use function substr;
 
 class NodeComparator
 {