diff --git a/src/ZipStreamer.php b/src/ZipStreamer.php
index 464bfba..e476eb6 100644
--- a/src/ZipStreamer.php
+++ b/src/ZipStreamer.php
@@ -356,7 +356,7 @@ private function streamFileData($stream, $compress, $level) {
       $compStream = DeflateStream::create($level);
     }
 
-    while (!feof($stream) && $data = fread($stream, self::STREAM_CHUNK_SIZE)) {
+    while (!feof($stream) && ($data = fread($stream, self::STREAM_CHUNK_SIZE)) !== false) {
       $dataLength->add(strlen($data));
       hash_update($hashCtx, $data);
       if (COMPR::DEFLATE === $compress) {