diff --git a/deps/datReader/Exd/Structs.h b/deps/datReader/Exd/Structs.h
index 6f3e9a12..56b7b1e7 100644
--- a/deps/datReader/Exd/Structs.h
+++ b/deps/datReader/Exd/Structs.h
@@ -498,7 +498,7 @@ namespace Excel
     uint8_t CastTime;
     uint8_t CastTimeLine;
     uint8_t Timeline;
-    int8_t padding1[3];
+    uint8_t padding1[3];
   };
 
   struct EventItemCastTimeLine