diff --git a/core/include/fpdfapi/fpdf_serial.h b/core/include/fpdfapi/fpdf_serial.h
index 4a32534..b0989f7 100644
--- a/core/include/fpdfapi/fpdf_serial.h
+++ b/core/include/fpdfapi/fpdf_serial.h
@@ -91,15 +91,11 @@
   FX_DWORD m_dwFlags;
   FX_POSITION m_Pos;
   FX_FILESIZE m_XrefStart;
-
   CFX_FileSizeListArray m_ObjectOffset;
-
-  CFX_DWordListArray m_ObjectSize;
   CFX_DWordArray m_NewObjNumArray;
-
   CPDF_Array* m_pIDArray;
-
   int32_t m_FileVersion;
+
   friend class CPDF_ObjectStream;
   friend class CPDF_XRefStream;
 };
diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index bb34e2b..fd35de9 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -1082,8 +1082,7 @@
 };
 typedef CFX_ListArrayTemplate<CFX_SortListArray<sizeof(FX_FILESIZE)>,
                               FX_FILESIZE> CFX_FileSizeListArray;
-typedef CFX_ListArrayTemplate<CFX_SortListArray<sizeof(FX_DWORD)>, FX_DWORD>
-    CFX_DWordListArray;
+
 typedef enum {
   Ready,
   ToBeContinued,
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 8c3defd..3fb5818 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -654,7 +654,6 @@
     }
     if (iSize > 0 && bEOF) {
       pCreator->m_ObjectOffset.Add(dwObjStmNum, 1);
-      pCreator->m_ObjectSize.Add(dwObjStmNum, 1);
       pCreator->m_ObjectOffset[dwObjStmNum] = objOffset;
     }
     m_iSeg = iSeg;
@@ -1265,7 +1264,6 @@
     CPDF_Object* pObj = m_pDocument->GetIndirectObject(objnum);
     if (!pObj) {
       m_ObjectOffset[objnum] = 0;
-      m_ObjectSize[objnum] = 0;
       return 0;
     }
     if (WriteIndirectObj(pObj)) {
@@ -1332,7 +1330,6 @@
     if (!iRet)
       continue;
 
-    m_ObjectSize[objnum] = (FX_DWORD)(m_Offset - m_ObjectOffset[objnum]);
     if (pPause && pPause->NeedToPauseNow()) {
       m_Pos = (void*)(uintptr_t)(objnum + 1);
       return 1;
@@ -1355,7 +1352,6 @@
     if (WriteIndirectObj(pObj)) {
       return -1;
     }
-    m_ObjectSize[objnum] = (FX_DWORD)(m_Offset - m_ObjectOffset[objnum]);
     index++;
     if (pPause && pPause->NeedToPauseNow()) {
       m_Pos = (FX_POSITION)(uintptr_t)index;
@@ -1385,7 +1381,6 @@
       j++;
     }
     m_ObjectOffset.Add(dwStart, j - dwStart);
-    m_ObjectSize.Add(dwStart, j - dwStart);
     dwStart = j;
   }
 }
@@ -1437,10 +1432,8 @@
     bool bExist = m_pParser && m_pParser->IsValidObjectNumber(dwCurObjNum) &&
                   m_ObjectOffset.GetPtrAt(dwCurObjNum);
     if (bExist || dwCurObjNum - dwLastObjNum > 1) {
-      if (!bNewStart) {
+      if (!bNewStart)
         m_ObjectOffset.Add(dwStartObjNum, dwLastObjNum - dwStartObjNum + 1);
-        m_ObjectSize.Add(dwStartObjNum, dwLastObjNum - dwStartObjNum + 1);
-      }
       dwStartObjNum = dwCurObjNum;
     }
     if (bNewStart) {
@@ -1450,7 +1443,6 @@
     dwLastObjNum = dwCurObjNum;
   }
   m_ObjectOffset.Add(dwStartObjNum, dwLastObjNum - dwStartObjNum + 1);
-  m_ObjectSize.Add(dwStartObjNum, dwLastObjNum - dwStartObjNum + 1);
 }
 void CPDF_Creator::AppendNewObjNum(FX_DWORD objbum) {
   int32_t iStart = 0, iFind = 0;
@@ -1609,8 +1601,6 @@
       }
       m_ObjectOffset.Add(m_dwLastObjNum, 1);
       m_ObjectOffset[m_dwLastObjNum] = saveOffset;
-      m_ObjectSize.Add(m_dwLastObjNum, 1);
-      m_ObjectSize[m_dwLastObjNum] = m_Offset - saveOffset;
       m_dwEnryptObjNum = m_dwLastObjNum;
       if (m_dwFlags & FPDFCREATE_INCREMENTAL) {
         m_NewObjNumArray.Add(m_dwLastObjNum);
@@ -1998,7 +1988,6 @@
   m_Offset = 0;
   m_dwLastObjNum = m_pDocument->GetLastObjNum();
   m_ObjectOffset.Clear();
-  m_ObjectSize.Clear();
   m_NewObjNumArray.RemoveAll();
   InitID();
   if (flags & FPDFCREATE_PROGRESSIVE) {