diff --git a/ntrtl.h b/ntrtl.h
index 2b1dc6e..44820a3 100644
--- a/ntrtl.h
+++ b/ntrtl.h
@@ -2827,7 +2827,7 @@ typedef struct _RTL_USER_PROCESS_PARAMETERS
 
     UNICODE_STRING RedirectionDllName; // REDSTONE4
     UNICODE_STRING HeapPartitionName; // 19H1
-    ULONG_PTR DefaultThreadpoolCpuSetMasks;
+    PULONGLONG DefaultThreadpoolCpuSetMasks;
     ULONG DefaultThreadpoolCpuSetMaskCount;
     ULONG DefaultThreadpoolThreadMaximum;
     ULONG HeapMemoryTypeMask; // WIN11
diff --git a/ntwow64.h b/ntwow64.h
index c118bb9..cc99706 100644
--- a/ntwow64.h
+++ b/ntwow64.h
@@ -240,7 +240,7 @@ typedef struct _RTL_USER_PROCESS_PARAMETERS32
 
     UNICODE_STRING32 RedirectionDllName; // REDSTONE4
     UNICODE_STRING32 HeapPartitionName; // 19H1
-    WOW64_POINTER(ULONG_PTR) DefaultThreadpoolCpuSetMasks;
+    WOW64_POINTER(ULONGLONG) DefaultThreadpoolCpuSetMasks;
     ULONG DefaultThreadpoolCpuSetMaskCount;
     ULONG DefaultThreadpoolThreadMaximum;
 } RTL_USER_PROCESS_PARAMETERS32, *PRTL_USER_PROCESS_PARAMETERS32;