diff --git a/stage23/lib/acpi.h b/stage23/lib/acpi.h
index 226ef6c4..26c64876 100644
--- a/stage23/lib/acpi.h
+++ b/stage23/lib/acpi.h
@@ -14,7 +14,7 @@ struct sdt {
     char     oem_id[6];
     char     oem_table_id[8];
     uint32_t oem_rev;
-    uint32_t creator_id;
+    char     creator_id[4];
     uint32_t creator_rev;
 } __attribute__((packed));