diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 95e0c65..29e30ce 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1818,7 +1818,7 @@
     memory_region_set_dirty(mr, 0, size);
 }
 
-static void acpi_build_update(void *build_opaque, uint32_t offset)
+static void acpi_build_update(void *build_opaque)
 {
     AcpiBuildState *build_state = build_opaque;
     AcpiBuildTables tables;