diff --git a/include/jemalloc/internal/hash.h b/include/jemalloc/internal/hash.h
index 188296cf..dcfc992d 100644
--- a/include/jemalloc/internal/hash.h
+++ b/include/jemalloc/internal/hash.h
@@ -260,22 +260,22 @@ hash_x64_128(const void *key, const int len, const uint32_t seed,
 		uint64_t k2 = 0;
 
 		switch (len & 15) {
-		case 15: k2 ^= ((uint64_t)(tail[14])) << 48;
-		case 14: k2 ^= ((uint64_t)(tail[13])) << 40;
-		case 13: k2 ^= ((uint64_t)(tail[12])) << 32;
-		case 12: k2 ^= ((uint64_t)(tail[11])) << 24;
-		case 11: k2 ^= ((uint64_t)(tail[10])) << 16;
-		case 10: k2 ^= ((uint64_t)(tail[ 9])) << 8;
+		case 15: k2 ^= ((uint64_t)(tail[14])) << 48; /* falls through */
+		case 14: k2 ^= ((uint64_t)(tail[13])) << 40; /* falls through */
+		case 13: k2 ^= ((uint64_t)(tail[12])) << 32; /* falls through */
+		case 12: k2 ^= ((uint64_t)(tail[11])) << 24; /* falls through */
+		case 11: k2 ^= ((uint64_t)(tail[10])) << 16; /* falls through */
+		case 10: k2 ^= ((uint64_t)(tail[ 9])) << 8;  /* falls through */
 		case  9: k2 ^= ((uint64_t)(tail[ 8])) << 0;
 			k2 *= c2; k2 = hash_rotl_64(k2, 33); k2 *= c1; h2 ^= k2;
-
-		case  8: k1 ^= ((uint64_t)(tail[ 7])) << 56;
-		case  7: k1 ^= ((uint64_t)(tail[ 6])) << 48;
-		case  6: k1 ^= ((uint64_t)(tail[ 5])) << 40;
-		case  5: k1 ^= ((uint64_t)(tail[ 4])) << 32;
-		case  4: k1 ^= ((uint64_t)(tail[ 3])) << 24;
-		case  3: k1 ^= ((uint64_t)(tail[ 2])) << 16;
-		case  2: k1 ^= ((uint64_t)(tail[ 1])) << 8;
+			/* falls through */
+		case  8: k1 ^= ((uint64_t)(tail[ 7])) << 56; /* falls through */
+		case  7: k1 ^= ((uint64_t)(tail[ 6])) << 48; /* falls through */
+		case  6: k1 ^= ((uint64_t)(tail[ 5])) << 40; /* falls through */
+		case  5: k1 ^= ((uint64_t)(tail[ 4])) << 32; /* falls through */
+		case  4: k1 ^= ((uint64_t)(tail[ 3])) << 24; /* falls through */
+		case  3: k1 ^= ((uint64_t)(tail[ 2])) << 16; /* falls through */
+		case  2: k1 ^= ((uint64_t)(tail[ 1])) << 8;  /* falls through */
 		case  1: k1 ^= ((uint64_t)(tail[ 0])) << 0;
 			k1 *= c1; k1 = hash_rotl_64(k1, 31); k1 *= c2; h1 ^= k1;
 		}