diff --git a/cucul/transform.c b/cucul/transform.c
index f017fd3..1d60186 100644
--- a/cucul/transform.c
+++ b/cucul/transform.c
@@ -225,11 +225,12 @@ static uint32_t flipchar(uint32_t ch)
          ' ', '"', '#', '\'', '-', '.', '*', '+', ':', '=', '0', '8',
          'A', 'H', 'I', 'M', 'O', 'T', 'U', 'V', 'W', 'X', 'Y', '^',
          '_', 'i', 'o', 'v', 'w', 'x', '|',
-         /* CP437 */
+         /* CP437 and box drawing */
          0x2591, 0x2592, 0x2593, 0x2588, 0x2584, 0x2580, /* ░ ▒ ▓ █ ▄ ▀ */
          0x2500, 0x2501, 0x2503, 0x2503, 0x253c, 0x254b, /* ─ ━ │ ┃ ┼ ╋ */
          0x252c, 0x2534, 0x2533, 0x253b, 0x2566, 0x2569, /* ┬ ┴ ┳ ┻ ╦ ╩ */
          0x2550, 0x2551, 0x256c, /* ═ ║ ╬ */
+         0x2575, 0x2577, 0x2579, 0x257b, /* ╵ ╷ ╹ ╻ */
          0
     };
 
@@ -274,6 +275,8 @@ static uint32_t flipchar(uint32_t ch)
          0x2554, 0x2557, /* ╔ ╗ */
          0x255a, 0x255d, /* ╚ ╝ */
          0x2560, 0x2563, /* ╠ ╣ */
+         0x2574, 0x2576, /* ╴ ╶ */
+         0x2578, 0x257a, /* ╸ ╺ */
          0
     };
 
@@ -298,11 +301,12 @@ static uint32_t flopchar(uint32_t ch)
          ' ', '(', ')', '*', '+', '-', '0', '3', '8', ':', '<', '=',
          '>', 'B', 'C', 'D', 'E', 'H', 'I', 'K', 'O', 'X', '[', ']',
          'c', 'o', '{', '|', '}',
-         /* CP437 */
+         /* CP437 and box drawing */
          0x2591, 0x2592, 0x2593, 0x2588, 0x258c, 0x2590, /* ░ ▒ ▓ █ ▌ ▐ */
          0x2500, 0x2501, 0x2503, 0x2503, 0x253c, 0x254b, /* ─ ━ │ ┃ ┼ ╋ */
          0x251c, 0x2524, 0x2523, 0x252b, 0x2560, 0x2563, /* ├ ┤ ┣ ┫ ╠ ╣ */
          0x2550, 0x2551, 0x256c, /* ═ ║ ╬ */
+         0x2574, 0x2576, 0x2578, 0x257a, /* ╴ ╶ ╸ ╺ */
          0
     };
 
@@ -353,6 +357,8 @@ static uint32_t flopchar(uint32_t ch)
          0x2554, 0x255a, /* ╔ ╚ */
          0x2557, 0x255d, /* ╗ ╝ */
          0x2566, 0x2569, /* ╦ ╩ */
+         0x2575, 0x2577, /* ╵ ╷ */
+         0x2579, 0x257b, /* ╹ ╻ */
          0
     };
 
@@ -444,6 +450,10 @@ static uint32_t rotatechar(uint32_t ch)
          0x2557, 0x255a, /* ╗ ╚ */
          0x2560, 0x2563, /* ╠ ╣ */
          0x2566, 0x2569, /* ╦ ╩ */
+         0x2574, 0x2576, /* ╴ ╶ */
+         0x2575, 0x2577, /* ╵ ╷ */
+         0x2578, 0x257a, /* ╸ ╺ */
+         0x2579, 0x257b, /* ╹ ╻ */
          0
     };