diff --git a/reactos/hal/halx86/include/halacpi.h b/reactos/hal/halx86/include/halacpi.h
index 9d0e1b2818c..aa342ab9215 100644
--- a/reactos/hal/halx86/include/halacpi.h
+++ b/reactos/hal/halx86/include/halacpi.h
@@ -30,6 +30,9 @@ typedef struct _ACPI_BIOS_MULTI_NODE
 #define PSDT_SIGNATURE 0x54445350               // "PSDT"
 #define SBST_SIGNATURE 0x54534253               // "SBST"
 #define DBGP_SIGNATURE 0x50474244               // "DBGP"
+#define XSDT_SIGNATURE 'TDSX'
+#define BOOT_SIGNATURE 'TOOB'
+#define SRAT_SIGNATURE 'TARS'
 
 //
 // FADT Flags