diff --git a/src/shared/acpi-fpdt.c b/src/shared/acpi-fpdt.c
index d1551acbc9..c94c0ed4ab 100644
--- a/src/shared/acpi-fpdt.c
+++ b/src/shared/acpi-fpdt.c
@@ -56,7 +56,7 @@ struct acpi_fpdt_boot {
         uint64_t startup_start;
         uint64_t exit_services_entry;
         uint64_t exit_services_exit;
-} _packed;
+} _packed_;
 
 /* /dev/mem is deprecated on many systems, try using /sys/firmware/acpi/fpdt parsing instead.
  * This code requires kernel version 5.12 on x86 based machines or 6.2 for arm64 */