diff --git a/sdk/xtdk/mmtypes.h b/sdk/xtdk/mmtypes.h
index 92c7baa..13d816e 100644
--- a/sdk/xtdk/mmtypes.h
+++ b/sdk/xtdk/mmtypes.h
@@ -110,6 +110,19 @@ typedef enum _MMSYSTEM_PTE_POOL_TYPE
     MaximumPtePoolTypes
 } MMSYSTEM_PTE_POOL_TYPE, *PMMSYSTEM_PTE_POOL_TYPE;
 
+/* Non-paged lookaside list indices */
+typedef enum _NONPAGED_LOOKASIDE_NUMBER
+{
+    LookasideSmallIrpList,
+    LookasideLargeIrpList,
+    LookasideMdlList,
+    LookasideCreateInfoList,
+    LookasideNameBufferList,
+    LookasideTwilightList,
+    LookasideCompletionList,
+    LookasideMaximumList
+} NONPAGED_LOOKASIDE_NUMBER, *PNONPAGED_LOOKASIDE_NUMBER;
+
 /* Memory Descriptor List structure definition */
 typedef struct _MDL
 {
diff --git a/sdk/xtdk/xtstruct.h b/sdk/xtdk/xtstruct.h
index 646c41b..0b61629 100644
--- a/sdk/xtdk/xtstruct.h
+++ b/sdk/xtdk/xtstruct.h
@@ -71,6 +71,7 @@ typedef enum _MMPFN_CACHE_ATTRIBUTE MMPFN_CACHE_ATTRIBUTE, *PMMPFN_CACHE_ATTRIBU
 typedef enum _MMPOOL_TYPE MMPOOL_TYPE, *PMMPOOL_TYPE;
 typedef enum _MMSYSTEM_PTE_POOL_TYPE MMSYSTEM_PTE_POOL_TYPE, *PMMSYSTEM_PTE_POOL_TYPE;
 typedef enum _MODE MODE, *PMODE;
+typedef enum _NONPAGED_LOOKASIDE_NUMBER NONPAGED_LOOKASIDE_NUMBER, *PNONPAGED_LOOKASIDE_NUMBER;
 typedef enum _POWER_ACTION POWER_ACTION, *PPOWER_ACTION;
 typedef enum _POWER_STATE_TYPE POWER_STATE_TYPE, *PPOWER_STATE_TYPE;
 typedef enum _PS_QUOTA_TYPE PS_QUOTA_TYPE, *PPS_QUOTA_TYPE;