diff --git a/php/src/file/IReader.php b/php/src/file/IReader.php
index 36a351b..fa96f7d 100644
--- a/php/src/file/IReader.php
+++ b/php/src/file/IReader.php
@@ -40,4 +40,6 @@ interface IReader extends _IFile {
   function unserialize(?array $options=null, bool $close=true, bool $alreadyLocked=false);
 
   function copyTo(IWriter $dest, bool $closeWriter=false, bool $closeReader=true): void;
+
+  function setCsvFlavour(?string $flavour): void;
 }
diff --git a/php/src/file/csv/CsvReader.php b/php/src/file/csv/CsvReader.php
index d923976..317fda0 100644
--- a/php/src/file/csv/CsvReader.php
+++ b/php/src/file/csv/CsvReader.php
@@ -2,7 +2,9 @@
 namespace nulib\file\csv;
 
 use nulib\file;
+use nulib\file\_IFile;
 use nulib\file\FileReader;
+use nulib\file\IReader;
 use nulib\file\tab\AbstractReader;
 use nulib\file\tab\TAbstractReader;
 
@@ -20,7 +22,12 @@ class CsvReader extends AbstractReader {
   protected ?string $inputEncoding;
 
   function getIterator() {
-    $reader = new FileReader(file::fix_dash($this->input));
+    $input = $this->input;
+    if ($input instanceof IReader) {
+      $reader = $input;
+    } else {
+      $reader = new FileReader(file::fix_dash($input));
+    }
     $inputEncoding = $this->inputEncoding;
     if ($inputEncoding !== null) {
       $reader->appendFilter("convert.iconv.$inputEncoding.utf-8");