diff --git a/src/mercury_engine_data_structures/formats/pkg.py b/src/mercury_engine_data_structures/formats/pkg.py
index 2e0e6da9..8fa4982b 100644
--- a/src/mercury_engine_data_structures/formats/pkg.py
+++ b/src/mercury_engine_data_structures/formats/pkg.py
@@ -96,7 +96,7 @@ def _build(self, obj: construct.Container, stream, context, path):
         construct.stream_seek(stream, 2 * self.int_size.length, 1, path)
 
         # Skip over file headers
-        construct.stream_seek(stream, len(obj.files) * file_entry_size, 1, path)
+        construct.stream_seek(stream, self.int_size.length + len(obj.files) * file_entry_size, 1, path)
 
         # Align to 128 bytes
         AlignTo(128)._build(None, stream, context, path)