diff --git a/core/fpdfapi/page/cpdf_occontext.cpp b/core/fpdfapi/page/cpdf_occontext.cpp
index 56592cb..21b8ec6 100644
--- a/core/fpdfapi/page/cpdf_occontext.cpp
+++ b/core/fpdfapi/page/cpdf_occontext.cpp
@@ -75,13 +75,13 @@
 ByteString GetUsageTypeString(CPDF_OCContext::UsageType eType) {
   ByteString csState;
   switch (eType) {
-    case CPDF_OCContext::Design:
+    case CPDF_OCContext::kDesign:
       csState = "Design";
       break;
-    case CPDF_OCContext::Print:
+    case CPDF_OCContext::kPrint:
       csState = "Print";
       break;
-    case CPDF_OCContext::Export:
+    case CPDF_OCContext::kExport:
       csState = "Export";
       break;
     default:
diff --git a/core/fpdfapi/page/cpdf_occontext.h b/core/fpdfapi/page/cpdf_occontext.h
index 6083d31..ab642c4 100644
--- a/core/fpdfapi/page/cpdf_occontext.h
+++ b/core/fpdfapi/page/cpdf_occontext.h
@@ -20,7 +20,7 @@
 
 class CPDF_OCContext final : public Retainable {
  public:
-  enum UsageType { View = 0, Design, Print, Export };
+  enum UsageType { kView = 0, kDesign, kPrint, kExport };
 
   CONSTRUCT_VIA_MAKE_RETAIN;
 
diff --git a/fpdfsdk/cpdfsdk_renderpage.cpp b/fpdfsdk/cpdfsdk_renderpage.cpp
index 1f7facc..2c71762 100644
--- a/fpdfsdk/cpdfsdk_renderpage.cpp
+++ b/fpdfsdk/cpdfsdk_renderpage.cpp
@@ -51,7 +51,7 @@
   }
 
   const CPDF_OCContext::UsageType usage =
-      (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
+      (flags & FPDF_PRINTING) ? CPDF_OCContext::kPrint : CPDF_OCContext::kView;
   pContext->m_pOptions->SetOCContext(
       pdfium::MakeRetain<CPDF_OCContext>(pPage->GetDocument(), usage));
 
diff --git a/fpdfsdk/fpdf_formfill.cpp b/fpdfsdk/fpdf_formfill.cpp
index 322c78b..486eded 100644
--- a/fpdfsdk/fpdf_formfill.cpp
+++ b/fpdfsdk/fpdf_formfill.cpp
@@ -215,7 +215,7 @@
 
     options.SetDrawAnnots(flags & FPDF_ANNOT);
     options.SetOCContext(
-        pdfium::MakeRetain<CPDF_OCContext>(pPDFDoc, CPDF_OCContext::View));
+        pdfium::MakeRetain<CPDF_OCContext>(pPDFDoc, CPDF_OCContext::kView));
 
     if (pPageView)
       pPageView->PageView_OnDraw(pDevice.get(), matrix, &options, rect);