diff --git a/vlib/v/checker/tests/incorrect_name_sum_type.out b/vlib/v/checker/tests/incorrect_name_sum_type.out
index 91a04121b8..bca6919b3c 100644
--- a/vlib/v/checker/tests/incorrect_name_sum_type.out
+++ b/vlib/v/checker/tests/incorrect_name_sum_type.out
@@ -1,12 +1,18 @@
 vlib/v/checker/tests/incorrect_name_sum_type.vv:1:1: error: sum type `integer` must begin with capital letter
-    1 | type integer = i8 | i16 | int | i64
+    1 | type integer = i16 | i64 | i8 | int
       | ~~~~~~~~~~~~
-    2 | type Integer = i8 | i16 | int | i64
+    2 | type Integer = i16 | i64 | i8 | int
     3 |
 vlib/v/checker/tests/incorrect_name_sum_type.vv:4:1: error: method overrides built-in sum type method
-    2 | type Integer = i8 | i16 | int | i64
+    2 | type Integer = i16 | i64 | i8 | int
     3 | 
-    4 | fn (i Integer) type_name() {
-      | ~~~~~~~~~~~~~~~~~~~~~~~~~~
+    4 | fn (i Integer) type_idx() {
+      | ~~~~~~~~~~~~~~~~~~~~~~~~~
     5 | }
     6 |
+vlib/v/checker/tests/incorrect_name_sum_type.vv:7:1: error: method overrides built-in sum type method
+    5 | }
+    6 | 
+    7 | fn (i Integer) type_name() {
+      | ~~~~~~~~~~~~~~~~~~~~~~~~~~
+    8 | }
diff --git a/vlib/v/checker/tests/incorrect_name_sum_type.vv b/vlib/v/checker/tests/incorrect_name_sum_type.vv
index e73300d599..9f5d2b59f3 100644
--- a/vlib/v/checker/tests/incorrect_name_sum_type.vv
+++ b/vlib/v/checker/tests/incorrect_name_sum_type.vv
@@ -1,6 +1,8 @@
-type integer = i8 | i16 | int | i64
-type Integer = i8 | i16 | int | i64
+type integer = i16 | i64 | i8 | int
+type Integer = i16 | i64 | i8 | int
+
+fn (i Integer) type_idx() {
+}
 
 fn (i Integer) type_name() {
 }
-