diff --git a/reactos/include/ndk/mmtypes.h b/reactos/include/ndk/mmtypes.h
index 3a5a4766b74..ddedd15b8a4 100644
--- a/reactos/include/ndk/mmtypes.h
+++ b/reactos/include/ndk/mmtypes.h
@@ -169,7 +169,8 @@ typedef enum _MEMORY_INFORMATION_CLASS
     MemoryBasicInformation,
     MemoryWorkingSetList,
     MemorySectionName,
-    MemoryBasicVlmInformation
+    MemoryBasicVlmInformation,
+    MemoryWorkingSetExList
 } MEMORY_INFORMATION_CLASS;
 
 //