diff --git a/micropython/extmod/modtrezorcrypto/modtrezorcrypto-random.h b/micropython/extmod/modtrezorcrypto/modtrezorcrypto-random.h
index bde50872..c8853105 100644
--- a/micropython/extmod/modtrezorcrypto/modtrezorcrypto-random.h
+++ b/micropython/extmod/modtrezorcrypto/modtrezorcrypto-random.h
@@ -56,11 +56,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_TrezorCrypto_Random_bytes_obj, mod_TrezorCr
 STATIC mp_obj_t mod_TrezorCrypto_Random_shuffle(mp_obj_t self, mp_obj_t data) {
     mp_uint_t item_cnt;
     mp_obj_t *items;
-    if (MP_OBJ_IS_TYPE(data, &mp_type_list)) {
-        mp_obj_list_get(data, &item_cnt, &items);
-    } else {
-        mp_raise_TypeError("List expected");
-    }
+    mp_obj_get_array(data, &item_cnt, &items);
     if (item_cnt > 256) {
         mp_raise_ValueError("Maximum list size is 256 items");
     }
diff --git a/micropython/extmod/modtrezorcrypto/modtrezorcrypto-ssss.h b/micropython/extmod/modtrezorcrypto/modtrezorcrypto-ssss.h
index b39cf95f..5d38ee0b 100644
--- a/micropython/extmod/modtrezorcrypto/modtrezorcrypto-ssss.h
+++ b/micropython/extmod/modtrezorcrypto/modtrezorcrypto-ssss.h
@@ -60,14 +60,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorCrypto_SSSS_split_obj, 4, 4
 STATIC mp_obj_t mod_TrezorCrypto_SSSS_combine(mp_obj_t self, mp_obj_t shares) {
     mp_uint_t n;
     mp_obj_t *share;
-    if (MP_OBJ_IS_TYPE(shares, &mp_type_tuple)) {
-        mp_obj_tuple_get(shares, &n, &share);
-    } else
-    if (MP_OBJ_IS_TYPE(shares, &mp_type_list)) {
-        mp_obj_list_get(shares, &n, &share);
-    } else {
-        mp_raise_TypeError("List or tuple expected");
-    }
+    mp_obj_get_array(shares, &n, &share);
     if (n < 1 || n > 15) {
         mp_raise_ValueError("Invalid number of shares");
     }
diff --git a/micropython/extmod/modtrezormsg/modtrezormsg.c b/micropython/extmod/modtrezormsg/modtrezormsg.c
index ddc86cce..4ec71a6f 100644
--- a/micropython/extmod/modtrezormsg/modtrezormsg.c
+++ b/micropython/extmod/modtrezormsg/modtrezormsg.c
@@ -47,14 +47,7 @@ STATIC mp_obj_t mod_TrezorMsg_Msg_make_new(const mp_obj_type_t *type, size_t n_a
 STATIC mp_obj_t mod_TrezorMsg_Msg_set_interfaces(mp_obj_t self, mp_obj_t ifaces) {
     mp_uint_t iface_cnt;
     mp_obj_t *usage_pages;
-    if (MP_OBJ_IS_TYPE(ifaces, &mp_type_tuple)) {
-        mp_obj_tuple_get(ifaces, &iface_cnt, &usage_pages);
-    } else
-    if (MP_OBJ_IS_TYPE(ifaces, &mp_type_list)) {
-        mp_obj_list_get(ifaces, &iface_cnt, &usage_pages);
-    } else {
-        mp_raise_TypeError("List or tuple expected");
-    }
+    mp_obj_get_array(ifaces, &iface_cnt, &usage_pages);
     if (iface_cnt > MAX_INTERFACES) {
         mp_raise_ValueError("Maximum number of interfaces exceeded");
     }