diff --git a/flash.py b/flash.py
index c8fa12f..8067b8d 100644
--- a/flash.py
+++ b/flash.py
@@ -25,7 +25,7 @@ def write_record(f, key, value):
     key_size = len(key) + 1
     value_size = len(value)
     record_size = key_size + value_size + 4
-    f.write(struct.pack("<l", record_size))
+    f.write(struct.pack(">l", record_size))
     f.write(key.encode())
     f.write(b"\x00")
     f.write(value)