diff --git a/src/ui/powerscreen.c b/src/ui/powerscreen.c
index 268281a..24d2818 100644
--- a/src/ui/powerscreen.c
+++ b/src/ui/powerscreen.c
@@ -48,7 +48,7 @@ static bool power_screen_dispatch(PowerScreen *screen,
     screen->choice = (screen->choice + state->up_down - state->down_down) %
                      POWER_SCREEN_NCHOICE;
     if (screen->choice < 0) {
-        screen->choice = POWER_SCREEN_NCHOICE - screen->choice;
+        screen->choice = POWER_SCREEN_NCHOICE + screen->choice;
     }
     if (state->force_draw || state->up_down || state->down_down) {
         lcd_clear(state->lcd);