diff --git a/util/proto/marshal_test.go b/util/proto/marshal_test.go
index d5758f2..5d887ce 100644
--- a/util/proto/marshal_test.go
+++ b/util/proto/marshal_test.go
@@ -49,6 +49,8 @@ func TestStableMarshalSingle(t *testing.T) {
 		{name: "fixed32", input: &generated.Primitives{FieldK: nonZero[uint32]()}},
 		{name: "enum, positive", input: &generated.Primitives{FieldH: generated.Primitives_POSITIVE}},
 		{name: "enum, negative", input: &generated.Primitives{FieldH: generated.Primitives_NEGATIVE}},
+		{name: "oneof, first", input: &generated.Primitives{FieldM: &generated.Primitives_FieldMa{FieldMa: []byte{4, 2}}}},
+		{name: "oneof, second", input: &generated.Primitives{FieldM: &generated.Primitives_FieldMe{FieldMe: nonZero[uint32]()}}},
 	}
 	for _, tc := range marshalCases {
 		t.Run(tc.name, func(t *testing.T) {
@@ -97,6 +99,9 @@ func primitivesEqual(t *testing.T, a *generated.Primitives, b *test.Primitives)
 	require.Equal(t, a.FieldJ, b.FieldJ)
 	require.Equal(t, a.FieldK, b.FieldK)
 	require.EqualValues(t, a.FieldH, b.FieldH)
+	require.Equal(t, a.GetFieldMa(), b.GetFieldMa())
+	require.Equal(t, a.GetFieldMe(), b.GetFieldMe())
+	require.Equal(t, a.GetFieldAux().GetInnerField(), b.GetFieldAux().GetInnerField())
 }
 
 func repPrimitivesEqual(t *testing.T, a *generated.RepPrimitives, b *test.RepPrimitives) {
diff --git a/util/proto/test/custom/test_frostfs.pb.go b/util/proto/test/custom/test_frostfs.pb.go
index c99234e..b1d2cf2 100644
Binary files a/util/proto/test/custom/test_frostfs.pb.go and b/util/proto/test/custom/test_frostfs.pb.go differ
diff --git a/util/proto/test/test.pb.go b/util/proto/test/test.pb.go
index 57f7fb0..de8ec65 100644
Binary files a/util/proto/test/test.pb.go and b/util/proto/test/test.pb.go differ
diff --git a/util/proto/test/test.proto b/util/proto/test/test.proto
index 14f6ac2..f33be49 100644
--- a/util/proto/test/test.proto
+++ b/util/proto/test/test.proto
@@ -22,6 +22,14 @@ message Primitives {
     NEGATIVE = -1;
   }
   SomeEnum field_h = 300;
+
+  message Aux { uint32 inner_field = 1; }
+
+  oneof field_m {
+    bytes field_ma = 401;
+    uint32 field_me = 402;
+    Aux field_aux = 403;
+  }
 }
 
 message RepPrimitives {