diff --git a/src/cryptsetup.c b/src/cryptsetup.c
index bf8bf278..9366f806 100644
--- a/src/cryptsetup.c
+++ b/src/cryptsetup.c
@@ -3194,6 +3194,11 @@ static int action_reencrypt_luks2(struct crypt_device *cd)
 
 	_set_reencryption_flags(&params.flags);
 
+	if (!opt_cipher && crypt_is_cipher_null(crypt_get_cipher(cd))) {
+		opt_cipher = strdup(DEFAULT_CIPHER(LUKS1));
+		log_std(_("Switching data encryption cipher to %s.\n"), opt_cipher);
+	}
+
 	if (!opt_cipher) {
 		strncpy(cipher, crypt_get_cipher(cd), MAX_CIPHER_LEN - 1);
 		strncpy(mode, crypt_get_cipher_mode(cd), MAX_CIPHER_LEN - 1);
diff --git a/tests/luks2-reencryption-test b/tests/luks2-reencryption-test
index 353085ad..014330cd 100755
--- a/tests/luks2-reencryption-test
+++ b/tests/luks2-reencryption-test
@@ -1406,9 +1406,9 @@ $CRYPTSETUP close $DEV_NAME
 echo $PWD1 | $CRYPTSETUP -q luksFormat --type luks1 -s 128 -c cipher_null-ecb --offset 8192 $FAST_PBKDF2 $DEV || fail
 $CRYPTSETUP convert -q --type luks2 $DEV || fail
 wipe $PWD1
-echo $PWD1 | $CRYPTSETUP reencrypt $DEV -c aes-xts-plain64 -q $FAST_PBKDF_ARGON || fail
+echo $PWD1 | $CRYPTSETUP reencrypt $DEV -q $FAST_PBKDF_ARGON >/dev/null || fail
 check_hash $PWD1 $HASH1
-# both keyslot and segment cipher must not be null
+# both keyslot and segment cipher must not be null after reencryption with default params
 $CRYPTSETUP luksDump $DEV | grep -q "cipher_null" && fail
 
 remove_mapping