diff --git a/src/system/boot/platform/bios_ia32/devices.cpp b/src/system/boot/platform/bios_ia32/devices.cpp
index 7a86f41e6f..59d2da3b9b 100644
--- a/src/system/boot/platform/bios_ia32/devices.cpp
+++ b/src/system/boot/platform/bios_ia32/devices.cpp
@@ -48,8 +48,7 @@ struct disk_address_packet {
 	uint16		number_of_blocks;
 	uint32		buffer;
 	uint64		lba;
-	uint64		flat_buffer;
-};
+} _PACKED;
 
 static const uint16 kParametersSizeVersion1 = 0x1a;
 static const uint16 kParametersSizeVersion2 = 0x1e;