diff --git a/src/Runtime/LoopManager.cs b/src/Runtime/LoopManager.cs
index 268fd86..1032050 100644
--- a/src/Runtime/LoopManager.cs
+++ b/src/Runtime/LoopManager.cs
@@ -101,6 +101,7 @@ private string ZipFiles()
             {
                 var fi = new FileInfo(entry);
                 var zipEntry = new ZipEntry(fi.Name) { DateTime = fi.LastWriteTime, Size = fi.Length };
+                if (_context.ZipPassword != null) zipEntry.AESKeySize = 256;
                 zipStream.PutNextEntry(zipEntry);
 
                 var buffer = new byte[4096];
diff --git a/src/Runtime/OutputWriter.cs b/src/Runtime/OutputWriter.cs
index 70820af..a998373 100644
--- a/src/Runtime/OutputWriter.cs
+++ b/src/Runtime/OutputWriter.cs
@@ -205,6 +205,7 @@ private string ZipFiles()
             {
                 var fi = new FileInfo(entry);
                 var zipEntry = new ZipEntry(fi.Name) { DateTime = fi.LastWriteTime, Size = fi.Length };
+                if (_context.ZipPassword != null) zipEntry.AESKeySize = 256;
                 zipStream.PutNextEntry(zipEntry);
                 
                 using (var fileStream = File.OpenRead(entry))