diff --git a/sdk/xtdk/amd64/ketypes.h b/sdk/xtdk/amd64/ketypes.h
index 7441427..7ef61ff 100644
--- a/sdk/xtdk/amd64/ketypes.h
+++ b/sdk/xtdk/amd64/ketypes.h
@@ -550,6 +550,7 @@ typedef struct _KPROCESSOR_BLOCK
     KRUNLEVEL RunLevel;
     KPROCESSOR_CONTROL_BLOCK Prcb;
     ULONG ContextSwitches;
+    ULONG StallScaleFactor;
 } KPROCESSOR_BLOCK, *PKPROCESSOR_BLOCK;
 
 /* Thread Environment Block (TEB) structure definition */
diff --git a/sdk/xtdk/i686/ketypes.h b/sdk/xtdk/i686/ketypes.h
index 4c01e93..1c3fc27 100644
--- a/sdk/xtdk/i686/ketypes.h
+++ b/sdk/xtdk/i686/ketypes.h
@@ -483,6 +483,7 @@ typedef struct _KPROCESSOR_BLOCK
     PKTSS TssBase;
     KPROCESSOR_CONTROL_BLOCK Prcb;
     ULONG ContextSwitches;
+    ULONG StallScaleFactor;
 } KPROCESSOR_BLOCK, *PKPROCESSOR_BLOCK;
 
 /* Thread Environment Block (TEB) structure definition */