diff --git a/tests/convert-tests/008-readonly-image/test.sh b/tests/convert-tests/008-readonly-image/test.sh
index b2f1ae37..27c9373e 100755
--- a/tests/convert-tests/008-readonly-image/test.sh
+++ b/tests/convert-tests/008-readonly-image/test.sh
@@ -10,7 +10,7 @@ check_prereq btrfs-convert
 
 default_mke2fs="mke2fs -t ext4 -b 4096"
 convert_test_preamble '' 'readonly image test' 16k "$default_mke2fs"
-convert_test_prep_fs "$default_mke2fs"
+convert_test_prep_fs $default_mke2fs
 run_check_umount_test_dev
 convert_test_do_convert
 run_check_mount_test_dev
diff --git a/tests/convert-tests/009-common-inode-flags/test.sh b/tests/convert-tests/009-common-inode-flags/test.sh
index a5828790..02823e14 100755
--- a/tests/convert-tests/009-common-inode-flags/test.sh
+++ b/tests/convert-tests/009-common-inode-flags/test.sh
@@ -11,7 +11,7 @@ check_prereq btrfs-convert
 fail=0
 default_mke2fs="mke2fs -t ext4 -b 4096"
 convert_test_preamble '' 'common inode flags test' 16k "$default_mke2fs"
-convert_test_prep_fs "$default_mke2fs"
+convert_test_prep_fs $default_mke2fs
 
 # create file with specific flags
 run_check $SUDO_HELPER touch "$TEST_MNT/flag_test"