diff --git a/include/acpi/acstruct.h b/include/acpi/acstruct.h
index e6b9e36..4e92645 100644
--- a/include/acpi/acstruct.h
+++ b/include/acpi/acstruct.h
@@ -78,7 +78,7 @@
 	u8                                  return_used;
 	u16                                 opcode;                             /* Current AML opcode */
 	u8                                  scope_depth;
-	u8                                  reserved1;
+	u8                                  pass_number;                        /* Parse pass during table load */
 	u32                                 arg_count;                          /* push for fixed or var args */
 	u32                                 aml_offset;
 	u32                                 arg_types;