diff --git a/source/arm11/atp.c b/source/arm11/atp.c
index 25a8d6a..b7d00a4 100644
--- a/source/arm11/atp.c
+++ b/source/arm11/atp.c
@@ -194,7 +194,7 @@ static void draw_options( int start_row, int start_idx, int option_cnt, int sele
     }
 }
 
-#define SELECTED_ROW(top, len, sel) ((top) < (len) ? (len)-(top)+(sel) : (sel)+(len)-(top))
+#define SELECTED_ROW(top, len, sel) (((top) < (len)) ? ((len)-(top)+(sel)) : ((sel)+(len)-(top)))
 #define REFRESH_PAGE {\
                         if( idx_top < title_len )\
                         {\