diff --git a/ntoskrnl/include/internal/ex.h b/ntoskrnl/include/internal/ex.h
index a8e715aadda..e09eb9ba05c 100644
--- a/ntoskrnl/include/internal/ex.h
+++ b/ntoskrnl/include/internal/ex.h
@@ -545,6 +545,15 @@ ExGetCountFastReference(IN EX_FAST_REF FastRef)
     return (ULONG)FastRef.RefCnt;
 }
 
+FORCEINLINE
+PEX_RUNDOWN_REF
+ExGetRunRefForCurrentProcessor(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware)
+{
+    return (PEX_RUNDOWN_REF)((ULONG_PTR)RunRefCacheAware->RunRefs +
+                             RunRefCacheAware->RunRefSize *
+                             (KeGetCurrentProcessorNumber() % RunRefCacheAware->Number));
+}
+
 FORCEINLINE
 VOID
 ExInitializeFastReference(OUT PEX_FAST_REF FastRef,