diff --git a/src/libutf.c b/src/libutf.c
index cc67a27..ab2bbb6 100644
--- a/src/libutf.c
+++ b/src/libutf.c
@@ -98,17 +98,17 @@ utf32be_to_utf8(rune_t c, size_t m){
 				| 0x00800000                              /* UTF-8 b24-23 */
 				| ((c & 0x03F000) << 4); /* UTF-32 b18-13 -> UTF-8 b24-17 */
 	if(m == 3)
-	case 3:	r =   (0xE << 4)                              /* UTF-8 b24-21 */
+	case 3:	r =   0x00E00000  /* 0xE == 0b1110 */         /* UTF-8 b24-21 */
 				| ((c & 0x00F000) << 4); /* UTF-32 b16-13 -> UTF-8 b20-17 */
 			r |=  0x00008000                              /* UTF-8 b16-15 */
 				| ((c & 0x000FC0) << 2); /* UTF-32 b12- 7 -> UTF-8 b14- 9 */
 	if(m == 2)
-	case 2: r =   (0xE << 3)                              /* UTF-8 b16-14 */
+	case 2: r =   0x0000C000  /* 0xC == 0b1100 */         /* UTF-8 b16-14 */
 				| ((c & 0x007C00) << 2); /* UTF-32 b11- 7 -> UTF-8 b13- 9 */
 			r |=  0x00000080                              /* UTF-8 b 8- 7 */
 				| (c & 0x00003F);                         /* UTF-8 b 6- 1 */
 	if(m == 1)
-	case 1: r = c & 0x00007F;                             /* UTF-8 b 7- 1 */
+	case 1: r = c & 0x00007F; /* 0x7 == 0b0111 */         /* UTF-8 b 7- 1 */
 	}
 	return r;
 }