diff --git a/reactos/include/ndk/pstypes.h b/reactos/include/ndk/pstypes.h
index 1e3f2f2ce81..3bd6f2c41bb 100644
--- a/reactos/include/ndk/pstypes.h
+++ b/reactos/include/ndk/pstypes.h
@@ -1283,7 +1283,7 @@ typedef struct _EPROCESS
         HARDWARE_PTE PageDirectoryPte;
         ULONGLONG Filler;
     };
-    ULONG Session;
+    PVOID Session;
     CHAR ImageFileName[16];
     LIST_ENTRY JobLinks;
     PVOID LockedPagesList;