diff --git a/src/point_one/fusion_engine/messages/st5635.h b/src/point_one/fusion_engine/messages/st5635.h
index 06cdfd9c..742e62a5 100644
--- a/src/point_one/fusion_engine/messages/st5635.h
+++ b/src/point_one/fusion_engine/messages/st5635.h
@@ -47,6 +47,7 @@ struct P1_ALIGNAS(4) ST5635CommandResponse : public MessagePayload {
   uint8_t data_1 = 0;
   uint8_t data_2 = 0;
   uint8_t data_3 = 0;
+  uint32_t sequence_number = 0;
 };
 
 /**
@@ -62,6 +63,7 @@ struct P1_ALIGNAS(4) ST5635Cmd : public MessagePayload {
   uint8_t address = 0;
   uint8_t val1 = 0;
   uint8_t val2 = 0;
+  uint32_t sequence_number = 0;
 };
 
 /**