diff --git a/utils.c b/utils.c
index 3a4bc92a..bba29305 100644
--- a/utils.c
+++ b/utils.c
@@ -1134,15 +1134,25 @@ int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mod
 	num_divs = 0;
 	last_size = size;
 	switch (unit_mode & UNITS_MODE_MASK) {
-	case UNITS_TBYTES: base *= mult; num_divs++;
-	case UNITS_GBYTES: base *= mult; num_divs++;
-	case UNITS_MBYTES: base *= mult; num_divs++;
-	case UNITS_KBYTES: num_divs++;
-			   break;
+	case UNITS_TBYTES:
+		base *= mult;
+		num_divs++;
+		__attribute__ ((fallthrough));
+	case UNITS_GBYTES:
+		base *= mult;
+		num_divs++;
+		__attribute__ ((fallthrough));
+	case UNITS_MBYTES:
+		base *= mult;
+		num_divs++;
+		__attribute__ ((fallthrough));
+	case UNITS_KBYTES:
+		num_divs++;
+		break;
 	case UNITS_BYTES:
-			   base = 1;
-			   num_divs = 0;
-			   break;
+		base = 1;
+		num_divs = 0;
+		break;
 	default:
 		if (negative) {
 			s64 ssize = (s64)size;
@@ -1907,13 +1917,17 @@ int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
 	default:
 	case 4:
 		allowed |= BTRFS_BLOCK_GROUP_RAID10;
+		__attribute__ ((fallthrough));
 	case 3:
 		allowed |= BTRFS_BLOCK_GROUP_RAID6;
+		__attribute__ ((fallthrough));
 	case 2:
 		allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
 			BTRFS_BLOCK_GROUP_RAID5;
+		__attribute__ ((fallthrough));
 	case 1:
 		allowed |= BTRFS_BLOCK_GROUP_DUP;
+		__attribute__ ((fallthrough));
 	}
 
 	if (dev_cnt > 1 && profile & BTRFS_BLOCK_GROUP_DUP) {