diff --git a/hw/loongarch/acpi-build.c b/hw/loongarch/acpi-build.c
index 0b62c3a2f7..ae292fc543 100644
--- a/hw/loongarch/acpi-build.c
+++ b/hw/loongarch/acpi-build.c
@@ -127,7 +127,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, LoongArchMachineState *lams)
         build_append_int_noprefix(table_data, 17, 1);    /* Type */
         build_append_int_noprefix(table_data, 15, 1);    /* Length */
         build_append_int_noprefix(table_data, 1, 1);     /* Version */
-        build_append_int_noprefix(table_data, i + 1, 4); /* ACPI Processor ID */
+        build_append_int_noprefix(table_data, i, 4);     /* ACPI Processor ID */
         build_append_int_noprefix(table_data, arch_id, 4); /* Core ID */
         build_append_int_noprefix(table_data, 1, 4);     /* Flags */
     }