diff --git a/extras/test/00_create.sh b/extras/test/00_create.sh
index 74351cf..ca0c453 100644
--- a/extras/test/00_create.sh
+++ b/extras/test/00_create.sh
@@ -27,4 +27,26 @@ if test_have_prereq DOAS; then
         '
 fi
 
+if test_have_prereq BTRFS; then
+    test_export "create_btrfs"
+    test_expect_success 'Testing tomb creation using BTRFS filesystem' '
+    tt_dig -s 50 &&
+    tt_forge --tomb-pwd $DUMMYPASS &&
+    print $DUMMYPASS \
+        | gpg --batch --passphrase-fd 0 --no-tty --no-options -d $tomb_key \
+        | xxd &&
+    tt_lock --tomb-pwd $DUMMYPASS --filesystem btrfs
+    '
+
+    test_export "create_btrfsmixed"
+    test_expect_success 'Testing tomb creation using BTRFS mixedmode filesystem' '
+    tt_dig -s 20 &&
+    tt_forge --tomb-pwd $DUMMYPASS &&
+    print $DUMMYPASS \
+        | gpg --batch --passphrase-fd 0 --no-tty --no-options -d $tomb_key \
+        | xxd &&
+    tt_lock --tomb-pwd $DUMMYPASS --filesystem btrfsmixedmode
+    '
+fi
+
 test_done
diff --git a/extras/test/setup b/extras/test/setup
index b4705b5..91b5f5b 100755
--- a/extras/test/setup
+++ b/extras/test/setup
@@ -57,6 +57,7 @@ command -v cloakify > /dev/null && test_set_prereq CLOAKIFY
 command -v decloakify > /dev/null && test_set_prereq DECLOAKIFY
 command -v doas > /dev/null && test_set_prereq DOAS
 command -v argon2 > /dev/null && test_set_prereq ARGON2
+command -v mkfs.btrfs > /dev/null && test_set_prereq BTRFS
 
 
 # GnuPG config
diff --git a/tomb b/tomb
index 08e5e84..db22c8f 100755
--- a/tomb
+++ b/tomb
@@ -2065,7 +2065,7 @@ lock_tomb_with_key() {
 	_verbose "Tomb found: ::1 tomb path::" $TOMBPATH
 
 	local filesystem=ext4
-    option_is_set --filesystem && {
+	option_is_set --filesystem && {
 		filesystem=`option_value --filesystem`
 		local tombsize=`stat --format '%s' $tombpath`
 		case $filesystem in
@@ -2074,13 +2074,13 @@ lock_tomb_with_key() {
 			btrfs)
 				if [[ $tombsize -lt 49283072 ]]; then
 					_failure "Filesystem ::1 filesystem:: not supported on tombs smaller than 47MB." \
-						$filesystem
+						 $filesystem
 				fi
 				;;
 			btrfsmixedmode)
 				if [[ $tombsize -lt 18874368 ]]; then
 					_failure "Filesystem ::1 filesystem:: not supported on tombs smaller than 18MB." \
-						$filesystem
+						 $filesystem
 				fi
 				;;
 			*)