diff --git a/src/activities/reader/EpubReaderActivity.cpp b/src/activities/reader/EpubReaderActivity.cpp
index c9c092c7..3e76a2c3 100644
--- a/src/activities/reader/EpubReaderActivity.cpp
+++ b/src/activities/reader/EpubReaderActivity.cpp
@@ -2136,7 +2136,8 @@ void EpubReaderActivity::renderContents(std::unique_ptr<Page> page, const int or
   }
 }
 
-void EpubReaderActivity::renderPageContentOnly(Page& page, const int orientedMarginTop, const int orientedMarginRight,
+void EpubReaderActivity::renderPageContentOnly(const Page& page, const int orientedMarginTop,
+                                               const int orientedMarginRight,
                                                const int orientedMarginBottom, const int orientedMarginLeft) {
   auto* fcm = renderer.getFontCacheManager();
   fcm->resetStats();
@@ -2153,7 +2154,8 @@ void EpubReaderActivity::renderPageContentOnly(Page& page, const int orientedMar
   // Status bar intentionally omitted — superimposed at display time with live values.
 }
 
-void EpubReaderActivity::displayPreRenderedPage(Page& page, const int orientedMarginTop, const int orientedMarginRight,
+void EpubReaderActivity::displayPreRenderedPage(const Page& page, const int orientedMarginTop,
+                                                const int orientedMarginRight,
                                                 const int orientedMarginBottom, const int orientedMarginLeft) {
   const int viewportHeight = std::max(0, renderer.getScreenHeight() - orientedMarginTop - orientedMarginBottom);
   const int contentTop = orientedMarginTop + getImageOnlyPageYOffset(page, viewportHeight);
diff --git a/src/activities/reader/EpubReaderActivity.h b/src/activities/reader/EpubReaderActivity.h
index e2f4273d..e788df88 100644
--- a/src/activities/reader/EpubReaderActivity.h
+++ b/src/activities/reader/EpubReaderActivity.h
@@ -249,12 +249,12 @@ class EpubReaderActivity final : public Activity {
   // Renders page content into the frame buffer (prewarm + BW pass) without drawing the status bar
   // or flushing to the display. Used by the pre-render pass so the status bar can be superimposed
   // at display time with live values (clock, battery).
-  void renderPageContentOnly(Page& page, int orientedMarginTop, int orientedMarginRight, int orientedMarginBottom,
+  void renderPageContentOnly(const Page& page, int orientedMarginTop, int orientedMarginRight, int orientedMarginBottom,
                              int orientedMarginLeft);
   // Draws the status bar over the current frame buffer and flushes to the display.
   // Handles the refresh cycle and grayscale AA pass. page must be the same page
   // that was last rendered into the buffer (needed for image AA re-render).
-  void displayPreRenderedPage(Page& page, int orientedMarginTop, int orientedMarginRight, int orientedMarginBottom,
+  void displayPreRenderedPage(const Page& page, int orientedMarginTop, int orientedMarginRight, int orientedMarginBottom,
                               int orientedMarginLeft);
   void renderStatusBar() const;
   void silentIndexNextChapterIfNeeded(uint16_t viewportWidth, uint16_t viewportHeight);