diff --git a/sdk/xtdk/amd64/ketypes.h b/sdk/xtdk/amd64/ketypes.h
index 560fbcf..15bf7c2 100644
--- a/sdk/xtdk/amd64/ketypes.h
+++ b/sdk/xtdk/amd64/ketypes.h
@@ -181,6 +181,14 @@ typedef struct ALIGN(16) _CONTEXT
     ULONG64 LastExceptionFromRip;
 } CONTEXT, *PCONTEXT;
 
+/* Pseudo 64-bit descriptor structure definition */
+typedef struct _KDESCRIPTOR
+{
+    USHORT Pad[3];
+    USHORT Limit;
+    PVOID Base;
+} KDESCRIPTOR, *PKDESCRIPTOR;
+
 /* Global Descriptor Table (GDT) entry union definition */
 typedef struct _KGDTENTRY
 {
diff --git a/sdk/xtdk/amd64/xtstruct.h b/sdk/xtdk/amd64/xtstruct.h
index 9e82743..3814624 100644
--- a/sdk/xtdk/amd64/xtstruct.h
+++ b/sdk/xtdk/amd64/xtstruct.h
@@ -21,6 +21,7 @@ typedef struct ALIGN(16) _CONTEXT CONTEXT, *PCONTEXT;
 typedef struct _CPUID_REGISTERS CPUID_REGISTERS, *PCPUID_REGISTERS;
 typedef struct _FLOATING_SAVE_AREA FLOATING_SAVE_AREA, *PFLOATING_SAVE_AREA;
 typedef struct _HARDWARE_PTE HARDWARE_PTE, *PHARDWARE_PTE;
+typedef struct _KDESCRIPTOR KDESCRIPTOR, *PKDESCRIPTOR;
 typedef struct _KEXCEPTION_FRAME KEXCEPTION_FRAME, *PKEXCEPTION_FRAME;
 typedef struct _KGDTENTRY KGDTENTRY, *PKGDTENTRY;
 typedef struct _KIDTENTRY KIDTENTRY, *PKIDTENTRY;
diff --git a/sdk/xtdk/i686/ketypes.h b/sdk/xtdk/i686/ketypes.h
index e0af62c..d63f071 100644
--- a/sdk/xtdk/i686/ketypes.h
+++ b/sdk/xtdk/i686/ketypes.h
@@ -139,6 +139,14 @@ typedef struct _CONTEXT
     UCHAR ExtendedRegisters[MAXIMUM_SUPPORTED_EXTENSION];
 } CONTEXT, *PCONTEXT;
 
+/* Pseudo descriptor structure definition */
+typedef struct _KDESCRIPTOR
+{
+    USHORT Pad;
+    USHORT Limit;
+    PVOID Base;
+} KDESCRIPTOR, *PKDESCRIPTOR;
+
 /* Global Descriptor Table (GDT) entry structure definition */
 typedef struct _KGDTENTRY
 {
diff --git a/sdk/xtdk/i686/xtstruct.h b/sdk/xtdk/i686/xtstruct.h
index a87be3b..7702a45 100644
--- a/sdk/xtdk/i686/xtstruct.h
+++ b/sdk/xtdk/i686/xtstruct.h
@@ -22,6 +22,7 @@ typedef struct _CPUID_REGISTERS CPUID_REGISTERS, *PCPUID_REGISTERS;
 typedef struct _FLOATING_SAVE_AREA FLOATING_SAVE_AREA, *PFLOATING_SAVE_AREA;
 typedef struct _HARDWARE_PTE HARDWARE_PTE, *PHARDWARE_PTE;
 typedef struct _HARDWARE_PTE_PAE HARDWARE_PTE_PAE, *PHARDWARE_PTE_PAE;
+typedef struct _KDESCRIPTOR KDESCRIPTOR, *PKDESCRIPTOR;
 typedef struct _KEXCEPTION_FRAME KEXCEPTION_FRAME, *PKEXCEPTION_FRAME;
 typedef struct _KGDTENTRY KGDTENTRY, *PKGDTENTRY;
 typedef struct _KIDTENTRY KIDTENTRY, *PKIDTENTRY;