diff --git a/acl/grpc/types_frostfs.pb.go b/acl/grpc/types_frostfs.pb.go
index 2b116bdd..b0551673 100644
Binary files a/acl/grpc/types_frostfs.pb.go and b/acl/grpc/types_frostfs.pb.go differ
diff --git a/ape/grpc/types_frostfs.pb.go b/ape/grpc/types_frostfs.pb.go
index 216415b4..e19d9f69 100644
Binary files a/ape/grpc/types_frostfs.pb.go and b/ape/grpc/types_frostfs.pb.go differ
diff --git a/netmap/grpc/types_frostfs.pb.go b/netmap/grpc/types_frostfs.pb.go
index e7597ea1..43af1037 100644
Binary files a/netmap/grpc/types_frostfs.pb.go and b/netmap/grpc/types_frostfs.pb.go differ
diff --git a/object/grpc/service_frostfs.pb.go b/object/grpc/service_frostfs.pb.go
index dea1b5b7..188d0326 100644
Binary files a/object/grpc/service_frostfs.pb.go and b/object/grpc/service_frostfs.pb.go differ
diff --git a/object/grpc/types_frostfs.pb.go b/object/grpc/types_frostfs.pb.go
index 42334170..9fc27697 100644
Binary files a/object/grpc/types_frostfs.pb.go and b/object/grpc/types_frostfs.pb.go differ
diff --git a/refs/grpc/types_frostfs.pb.go b/refs/grpc/types_frostfs.pb.go
index 35febe91..5f35eba2 100644
Binary files a/refs/grpc/types_frostfs.pb.go and b/refs/grpc/types_frostfs.pb.go differ
diff --git a/session/grpc/types_frostfs.pb.go b/session/grpc/types_frostfs.pb.go
index 41ff5d9d..c92ab28b 100644
Binary files a/session/grpc/types_frostfs.pb.go and b/session/grpc/types_frostfs.pb.go differ
diff --git a/util/proto/test/custom/test_frostfs.pb.go b/util/proto/test/custom/test_frostfs.pb.go
index 97efa51c..005d6d11 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/protogen/internalgengo/json.go b/util/protogen/internalgengo/json.go
index f7cd284d..95a06d59 100644
--- a/util/protogen/internalgengo/json.go
+++ b/util/protogen/internalgengo/json.go
@@ -195,7 +195,13 @@ func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name strin
 	case protoreflect.BoolKind:
 		template = "out.Bool(%s)"
 	case protoreflect.EnumKind:
-		template = "out.Int32(int32(%s))"
+		enumType := fieldType(g, f).String()
+		template = `v := int32(%s)
+			if vv, ok := ` + enumType + `_name[v]; ok {
+				out.String(vv)
+			} else {
+				out.Int32(v)
+			}`
 	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
 		template = "out.Int32(%s)"
 	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind: