diff --git a/test/person.pb b/test/person.pb
index e4b7ff57c89e5f07b21199650c489055019d2511..93a39def82371570a29aa95f31224e409558ea12 100644
GIT binary patch
literal 34
Xcmd;>#walBCyS&O0|Y1upo;(iZV&}U

literal 16
Tcmd;>#walBCyS&O0|Wp79()3d

diff --git a/test/person.protosope.txt b/test/person.protosope.txt
index 8663001..7dc2393 100644
--- a/test/person.protosope.txt
+++ b/test/person.protosope.txt
@@ -1,3 +1,8 @@
 1: 150
 2: 81050
 3: 42i64
+4: {
+	1: 150
+	2: 81050
+	3: 42i64
+}
diff --git a/test/protobuf_decode_gleam_test.gleam b/test/protobuf_decode_gleam_test.gleam
index 3db5a93..19f4ec5 100644
--- a/test/protobuf_decode_gleam_test.gleam
+++ b/test/protobuf_decode_gleam_test.gleam
@@ -1,4 +1,5 @@
 import gleam/dynamic/decode.{type Decoder}
+import gleam/option
 import gleeunit
 import protobuf_decode_gleam.{decode, decode_u64, decode_uint}
 import simplifile as file
@@ -8,21 +9,37 @@ pub fn main() -> Nil {
 }
 
 type Person {
-  Person(id: Int, age: Int, score: Int)
+  Person(id: Int, age: Int, score: Int, self: option.Option(Person))
 }
 
 fn person_decoder() -> Decoder(Person) {
   use id <- decode.field(3, decode_u64())
   use age <- decode.field(1, decode_uint())
   use score <- decode.field(2, decode_uint())
-  decode.success(Person(id:, age:, score:))
+  use person <- decode.optional_field(
+    4,
+    option.None,
+    person_decoder() |> decode.map(option.Some),
+  )
+  decode.success(Person(id:, age:, score:, self: person))
 }
 
 pub fn person_pb_test() {
   let path = "./test/person.pb"
   let assert Ok(bits) = file.read_bits(from: path)
   let assert Ok(person) = decode(from: bits, using: person_decoder())
-  assert person == Person(id: 42, age: 150, score: 81_050)
+  assert person
+    == Person(
+      id: 42,
+      age: 150,
+      score: 81_050,
+      self: option.Some(Person(
+        id: 42,
+        age: 150,
+        score: 81_050,
+        self: option.None,
+      )),
+    )
 }
 
 type TwoInts {