diff --git a/dicformat.bt b/dicformat.bt
index aabc004..21fd427 100644
--- a/dicformat.bt
+++ b/dicformat.bt
@@ -810,7 +810,7 @@ typedef struct
     uint length;
     uint64 crc64 <format=hex>;
     DumpHardwareEntry dumpHardware[entries];
-} DumpHardwareHeader;
+} DumpHardwareHeader <optimize=false>;
 
 typedef struct
 {