diff --git a/src/SourceLocator/Ast/Locator.php b/src/SourceLocator/Ast/Locator.php
index fa3c3ccdb..d83b068c5 100644
--- a/src/SourceLocator/Ast/Locator.php
+++ b/src/SourceLocator/Ast/Locator.php
@@ -13,6 +13,7 @@
 use Roave\BetterReflection\SourceLocator\Ast\Strategy\NodeToReflection;
 use Roave\BetterReflection\SourceLocator\Located\LocatedSource;
 use Throwable;
+use function strtolower;
 
 /**
  * @internal