diff --git a/src/ChunkedStreamDecoder.php b/src/ChunkedStreamDecoder.php
index fc76d52..bc150ad 100644
--- a/src/ChunkedStreamDecoder.php
+++ b/src/ChunkedStreamDecoder.php
@@ -111,7 +111,7 @@ protected function iterateBuffer()
                 }
             }
             $this->nextChunkIsLength = false;
-            if (dechex(@hexdec($lengthChunk)) !== strtolower($lengthChunk)) {
+            if (dechex((int)@hexdec($lengthChunk)) !== strtolower($lengthChunk)) {
                 $this->emit('error', array(
                     new Exception('Unable to validate "' . $lengthChunk . '" as chunk length header'),
                 ));