diff --git a/src/Finder.php b/src/Finder.php
index 646eda8..33c56df 100644
--- a/src/Finder.php
+++ b/src/Finder.php
@@ -138,10 +138,10 @@ public static function rows(iterable $data, callable $filter, bool $preserveKey
                 continue;
             }
 
-            if (! is_numeric($key)) {
+            if ($preserveKey || ! is_numeric($key)) {
                 $rowKey = $key;
             } else {
-                $rowKey = $preserveKey ? $key : $newKey;
+                $rowKey = $newKey;
                 ++$newKey;
             }