diff --git a/Android.mk b/Android.mk
index b1ee244..776e6ea 100644
--- a/Android.mk
+++ b/Android.mk
@@ -131,6 +131,12 @@
 LOCAL_CFLAGS += -DRECOVERY_UI_ANIMATION_FPS=30
 endif
 
+ifneq ($(TARGET_RECOVERY_UI_MENU_UNUSABLE_ROWS),)
+LOCAL_CFLAGS += -DRECOVERY_UI_MENU_UNUSABLE_ROWS=$(TARGET_RECOVERY_UI_MENU_UNUSABLE_ROWS)
+else
+LOCAL_CFLAGS += -DRECOVERY_UI_MENU_UNUSABLE_ROWS=9
+endif
+
 ifneq ($(TARGET_RECOVERY_UI_VR_STEREO_OFFSET),)
 LOCAL_CFLAGS += -DRECOVERY_UI_VR_STEREO_OFFSET=$(TARGET_RECOVERY_UI_VR_STEREO_OFFSET)
 else
diff --git a/wear_ui.cpp b/wear_ui.cpp
index b8801a0..169ef20 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -51,8 +51,9 @@
 }
 
 WearRecoveryUI::WearRecoveryUI()
-    : kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE), menu_unusable_rows(9) {
-  // TODO: menu_unusable_rows should be computed based on the lines in draw_screen_locked().
+    : kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE),
+      kMenuUnusableRows(RECOVERY_UI_MENU_UNUSABLE_ROWS) {
+  // TODO: kMenuUnusableRows should be computed based on the lines in draw_screen_locked().
 
   // TODO: The following three variables are likely not needed. The first two are detected
   // automatically in ScreenRecoveryUI::LoadAnimation(), based on the actual files seen on device.
@@ -268,7 +269,7 @@
     show_menu = true;
     menu_sel = initial_selection;
     menu_start = 0;
-    menu_end = visible_text_rows - 1 - menu_unusable_rows;
+    menu_end = visible_text_rows - 1 - kMenuUnusableRows;
     if (menu_items <= menu_end) menu_end = menu_items;
     update_screen_locked();
   }
diff --git a/wear_ui.h b/wear_ui.h
index c2bbdb6..3bd90b6 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -46,7 +46,7 @@
 
   // Unusable rows when displaying the recovery menu, including the lines for headers (Android
   // Recovery, build id and etc) and the bottom lines that may otherwise go out of the screen.
-  int menu_unusable_rows;
+  const int kMenuUnusableRows;
 
   int GetProgressBaseline() const override;