diff --git a/ntoskrnl/mm/ARM3/miarm.h b/ntoskrnl/mm/ARM3/miarm.h
index 84357d1e7ea..053ae8047dd 100644
--- a/ntoskrnl/mm/ARM3/miarm.h
+++ b/ntoskrnl/mm/ARM3/miarm.h
@@ -664,6 +664,13 @@ extern LIST_ENTRY MmWorkingSetExpansionHead;
 extern KSPIN_LOCK MmExpansionLock;
 extern PETHREAD MiExpansionLockOwner;
 
+FORCEINLINE
+BOOLEAN
+MI_IS_PROCESS_WORKING_SET(PMMSUPPORT WorkingSet)
+{
+    return (WorkingSet != &MmSystemCacheWs) && !WorkingSet->Flags.SessionSpace;
+}
+
 FORCEINLINE
 BOOLEAN
 MiIsMemoryTypeFree(TYPE_OF_MEMORY MemoryType)