diff --git a/src/Base32.php b/src/Base32.php
index 48d00b9..b6317ff 100644
--- a/src/Base32.php
+++ b/src/Base32.php
@@ -456,7 +456,7 @@ protected static function doEncode(
         #[\SensitiveParameter]
         string $src,
         bool $upper = false,
-        $pad = true
+        bool $pad = true
     ): string {
         // We do this to reduce code duplication:
         $method = $upper