diff --git a/ais2ih_STdC/driver/ais2ih_reg.h b/ais2ih_STdC/driver/ais2ih_reg.h
index a804a269..a16b0340 100644
--- a/ais2ih_STdC/driver/ais2ih_reg.h
+++ b/ais2ih_STdC/driver/ais2ih_reg.h
@@ -527,7 +527,6 @@ typedef struct {
   uint8_t zh                         : 1;
   uint8_t zl                         : 1;
   uint8_t yh                         : 1;
-  uint8_t xh                         : 1;
   uint8_t yl                         : 1;
   uint8_t xh                         : 1;
   uint8_t xl                         : 1;