diff --git a/NTOSKRNL/CC/ccpinsupport.cpp b/NTOSKRNL/CC/ccpinsupport.cpp
index 781cd67..504ace9 100644
--- a/NTOSKRNL/CC/ccpinsupport.cpp
+++ b/NTOSKRNL/CC/ccpinsupport.cpp
@@ -79,7 +79,7 @@ CcMapDataForOverwrite(
     ULONG readClusterSize = {0};
 
   
-    pageCount = (Length >> PAGE_SHIFT) + (((FileOffset->LowPart & PAGE_OFFSET) + 4095 + (Length & PAGE_OFFSET)) >> PAGE_SHIFT);
+    pageCount = CalculatePageCount(Length,FileOffset);
     currentThread = (PETHREAD)KeGetCurrentThread();
     sharedCacheMap = (PSHARED_CACHE_MAP)FileObject->SectionObjectPointer->SharedCacheMap;