diff --git a/sdk/xtdk/amd64/ketypes.h b/sdk/xtdk/amd64/ketypes.h
index 8bd514b..c177871 100644
--- a/sdk/xtdk/amd64/ketypes.h
+++ b/sdk/xtdk/amd64/ketypes.h
@@ -241,7 +241,7 @@ typedef struct _KSWITCH_FRAME
     ULONG64 P4Home;
     ULONG64 P5Home;
     ULONG MxCsr;
-    UCHAR ApcBypass;
+    KIRQL ApcBypass;
     UCHAR Fill1[3];
     ULONG64 Rbp;
     ULONG64 Return;
@@ -255,8 +255,8 @@ typedef struct _KTRAP_FRAME
     ULONG64 P3Home;
     ULONG64 P4Home;
     ULONG64 P5;
-    CHAR PreviousMode;
-    UCHAR PreviousIrql;
+    KPROCESSOR_MODE PreviousMode;
+    KIRQL PreviousIrql;
     UCHAR FaultIndicator;
     UCHAR ExceptionActive;
     ULONG MxCsr;
diff --git a/sdk/xtdk/xtbase.h b/sdk/xtdk/xtbase.h
index b430ec8..429edfc 100644
--- a/sdk/xtdk/xtbase.h
+++ b/sdk/xtdk/xtbase.h
@@ -14,6 +14,12 @@
 #include <xttypes.h>
 
 
+/* Interrupt Request Level (IRQL) */
+typedef UCHAR KIRQL, *PKIRQL;
+
+/* Processor modes */
+typedef CHAR KPROCESSOR_MODE, *PKPROCESSOR_MODE;
+
 /* 128-bit buffer containing a unique identifier value */
 typedef struct _GUID
 {