diff --git a/src/Encoding/FilteredStream.php b/src/Encoding/FilteredStream.php
index 4b296ed..7ac4b75 100644
--- a/src/Encoding/FilteredStream.php
+++ b/src/Encoding/FilteredStream.php
@@ -151,6 +151,10 @@ public function getSize()
      */
     public function __toString()
     {
+        if ($this->stream->isSeekable()) {
+            $this->stream->rewind();
+        }
+
         return $this->getContents();
     }