diff --git a/sdk/xtdk/xtstruct.h b/sdk/xtdk/xtstruct.h
index 4264e21..39c4f1f 100644
--- a/sdk/xtdk/xtstruct.h
+++ b/sdk/xtdk/xtstruct.h
@@ -87,6 +87,7 @@ typedef struct _ANSI_STRING64 ANSI_STRING64, *PANSI_STRING64;
 typedef struct _CPPORT CPPORT, *PCPPORT;
 typedef const struct _CMMPAGEMAP_ROUTINES CMMPAGEMAP_ROUTINES, *PCMMPAGEMAP_ROUTINES;
 typedef struct _CSTRING CSTRING, *PCSTRING;
+typedef struct _DOUBLE_ULONG_PTR DOUBLE_ULONG_PTR, *PDOUBLE_ULONG_PTR;
 typedef struct _EFI_1394_DEVICE_PATH EFI_1394_DEVICE_PATH, *PEFI_1394_DEVICE_PATH;
 typedef struct _EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR, *PEFI_ACPI_ADDRESS_SPACE_DESCRIPTOR;
 typedef struct _EFI_ACPI_ADR_DEVICE_PATH EFI_ACPI_ADR_DEVICE_PATH, *PEFI_ACPI_ADR_DEVICE_PATH;
diff --git a/sdk/xtdk/xttypes.h b/sdk/xtdk/xttypes.h
index 14e6e89..239dc19 100644
--- a/sdk/xtdk/xttypes.h
+++ b/sdk/xtdk/xttypes.h
@@ -156,6 +156,13 @@ typedef LPCUWSTR PCUTSTR, LPCUTSTR;
 /* Variadic ABI types */
 typedef __builtin_va_list VA_LIST, *PVA_LIST;
 
+/* Double ULONG_PTR structure */
+typedef struct _DOUBLE_ULONG_PTR
+{
+    ULONG_PTR LowPart;
+    ULONG_PTR HighPart;
+} DOUBLE_ULONG_PTR, *PDOUBLE_ULONG_PTR;
+
 /* 128-bit floats structure */
 typedef struct _FLOAT128
 {