diff --git a/core/fpdfdoc/cpvt_variabletext.cpp b/core/fpdfdoc/cpvt_variabletext.cpp
index b404838..19da19f 100644
--- a/core/fpdfdoc/cpvt_variabletext.cpp
+++ b/core/fpdfdoc/cpvt_variabletext.cpp
@@ -305,7 +305,7 @@
 void CPVT_VariableText::UpdateWordPlace(CPVT_WordPlace& place) const {
   if (place.nSecIndex < 0)
     place = GetBeginWordPlace();
-  if (place.nSecIndex >= fxcrt::CollectionSize<int32_t>(m_SectionArray))
+  if (static_cast<size_t>(place.nSecIndex) >= m_SectionArray.size())
     place = GetEndWordPlace();
 
   place = PrevLineHeaderPlace(place);
@@ -337,8 +337,7 @@
   int32_t nOldIndex = 0;
   int32_t nIndex = 0;
   bool bFound = false;
-  for (int32_t i = 0, sz = fxcrt::CollectionSize<int32_t>(m_SectionArray);
-       i < sz; i++) {
+  for (size_t i = 0; i < m_SectionArray.size(); ++i) {
     CPVT_Section* pSection = m_SectionArray[i].get();
     nIndex += pSection->GetWordArraySize();
     if (nIndex == index) {
@@ -347,13 +346,13 @@
       break;
     }
     if (nIndex > index) {
-      place.nSecIndex = i;
+      place.nSecIndex = pdfium::base::checked_cast<int32_t>(i);
       place.nWordIndex = index - nOldIndex - 1;
       pSection->UpdateWordPlace(place);
       bFound = true;
       break;
     }
-    if (i != sz - 1)
+    if (i != m_SectionArray.size() - 1)
       nIndex += kReturnLength;
     nOldIndex = nIndex;
   }
@@ -376,7 +375,7 @@
     const CPVT_WordPlace& place) const {
   if (place.nSecIndex < 0)
     return GetBeginWordPlace();
-  if (place.nSecIndex >= fxcrt::CollectionSize<int32_t>(m_SectionArray))
+  if (static_cast<size_t>(place.nSecIndex) >= m_SectionArray.size())
     return GetEndWordPlace();
 
   CPVT_Section* pSection = m_SectionArray[place.nSecIndex].get();
@@ -391,7 +390,7 @@
     const CPVT_WordPlace& place) const {
   if (place.nSecIndex < 0)
     return GetBeginWordPlace();
-  if (place.nSecIndex >= fxcrt::CollectionSize<int32_t>(m_SectionArray))
+  if (static_cast<size_t>(place.nSecIndex) >= m_SectionArray.size())
     return GetEndWordPlace();
 
   CPVT_Section* pSection = m_SectionArray[place.nSecIndex].get();