diff --git a/sdk/include/ndk/obtypes.h b/sdk/include/ndk/obtypes.h
index aa7968fd77c..034f101188c 100644
--- a/sdk/include/ndk/obtypes.h
+++ b/sdk/include/ndk/obtypes.h
@@ -434,6 +434,9 @@ typedef struct _OBJECT_HEADER_NAME_INFO
     ULONG QueryReferences;
     ULONG Reserved2;
     ULONG DbgReferenceCount;
+#ifdef _WIN64
+    ULONG64 Reserved3;
+#endif
 } OBJECT_HEADER_NAME_INFO, *POBJECT_HEADER_NAME_INFO;
 
 typedef struct _OBJECT_HANDLE_COUNT_ENTRY
@@ -471,6 +474,9 @@ typedef struct _OBJECT_HEADER_QUOTA_INFO
     ULONG NonPagedPoolCharge;
     ULONG SecurityDescriptorCharge;
     PEPROCESS ExclusiveProcess;
+#ifdef _WIN64
+    ULONG64 Reserved;
+#endif
 } OBJECT_HEADER_QUOTA_INFO, *POBJECT_HEADER_QUOTA_INFO;
 
 //
@@ -478,10 +484,10 @@ typedef struct _OBJECT_HEADER_QUOTA_INFO
 //
 typedef struct _OBJECT_HEADER
 {
-    LONG PointerCount;
+    LONG_PTR PointerCount;
     union
     {
-        LONG HandleCount;
+        LONG_PTR HandleCount;
         volatile PVOID NextToFree;
     };
     POBJECT_TYPE Type;