diff --git a/src/models/OptimizedImage.php b/src/models/OptimizedImage.php
index 642944d..2d269e0 100644
--- a/src/models/OptimizedImage.php
+++ b/src/models/OptimizedImage.php
@@ -620,7 +620,7 @@ protected function getSrcsetSubsetArray(array $set, int $width, string $comparis
         }
         // Sort the arrays by numeric key
         ksort($set, SORT_NUMERIC);
-        ksort($this->variantSourceWidths, SORT_NUMERIC);
+        sort($this->variantSourceWidths, SORT_NUMERIC);
         foreach ($this->variantSourceWidths as $variantSourceWidth) {
             $match = false;
             switch ($comparison) {