diff --git a/src/main/java/com/iyxan23/zipalignjava/ZipAlign.java b/src/main/java/com/iyxan23/zipalignjava/ZipAlign.java
index 48fb0c5..7ad9dbf 100644
--- a/src/main/java/com/iyxan23/zipalignjava/ZipAlign.java
+++ b/src/main/java/com/iyxan23/zipalignjava/ZipAlign.java
@@ -293,7 +293,10 @@ public static void alignZip(RandomAccessFile file, OutputStream out, int alignme
         if (neededAlignments.size() == 0) {
             // there is no needed alignment, stream it all!
             byte[] buffer = new byte[8192];
-            while (file.read(buffer) != -1) out.write(buffer);
+            int len;
+            while (-1 != (len = file.read(buffer))){
+                out.write(buffer, 0, len);
+            }
             return;
         }