diff --git a/src/Metadata/MetadataParser.php b/src/Metadata/MetadataParser.php
index e96febe..0904ece 100644
--- a/src/Metadata/MetadataParser.php
+++ b/src/Metadata/MetadataParser.php
@@ -101,7 +101,7 @@ private static function findElements(string $xml, string $tagName): array
             $closePattern = '/<\/([\w]+:)?' . \preg_quote($tagName, '/') . '\s*>/i';
             if (\preg_match($closePattern, $xml, $closeMatch, \PREG_OFFSET_CAPTURE, $offset + \strlen($tagText))) {
                 $closeTag = $closeMatch[0][0];
-                $closePos = $closeMatch[0][1];
+                $closePos = (int) $closeMatch[0][1];
                 $fullElement = \substr($xml, $offset, $closePos + \strlen($closeTag) - $offset);
                 $elements[] = $fullElement;
             } else {