diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc37d2b..a897eb8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## unreleased
+
+- Iconv: Fix warning on PHP 8.2 when passing `null` as source encoding.
+
+
 ## [1.0.1] – 2021-05-23
 
 The project has been revived and is now available under the name [`fossar/transcoder`](https://packagist.org/packages/fossar/transcoder). This is a first release since the fork.
diff --git a/src/IconvTranscoder.php b/src/IconvTranscoder.php
index 9fe8825..d2e9d96 100644
--- a/src/IconvTranscoder.php
+++ b/src/IconvTranscoder.php
@@ -46,7 +46,7 @@ function ($no, $message) use ($string) {
         );
 
         try {
-            $result = iconv($from, $to ?: $this->defaultEncoding, $string);
+            $result = iconv($from ?: '', $to ?: $this->defaultEncoding, $string);
         } finally {
             restore_error_handler();
         }