diff --git a/stubs/Php80.phpstub b/stubs/Php80.phpstub
index 42e0ad799a5..2f2d5bf0b9b 100644
--- a/stubs/Php80.phpstub
+++ b/stubs/Php80.phpstub
@@ -240,6 +240,13 @@ class DatePeriod implements IteratorAggregate
  */
 function get_headers(string $url, bool $associative = false, $context = null) : array|false {}
 
+/**
+ * @psalm-pure
+ *
+ * @psalm-flow ($values) -> return
+ */
+function pack(string $format, mixed ...$values): string {}
+
 final class CurlHandle
 {
     private function __construct()