diff --git a/core/shared/src/main/scala/coursier/core/Repository.scala b/core/shared/src/main/scala/coursier/core/Repository.scala
index 297f95f9a..f52917b15 100644
--- a/core/shared/src/main/scala/coursier/core/Repository.scala
+++ b/core/shared/src/main/scala/coursier/core/Repository.scala
@@ -8,7 +8,7 @@ import scalaz._
 
 import coursier.core.compatibility.encodeURIComponent
 
-trait Repository {
+trait Repository extends Product with Serializable {
   def find[F[_]](
     module: Module,
     version: String,
diff --git a/tests/shared/src/test/scala/coursier/test/ResolutionTests.scala b/tests/shared/src/test/scala/coursier/test/ResolutionTests.scala
index e8dab1420..c83a9ddd5 100644
--- a/tests/shared/src/test/scala/coursier/test/ResolutionTests.scala
+++ b/tests/shared/src/test/scala/coursier/test/ResolutionTests.scala
@@ -166,7 +166,7 @@ object ResolutionTests extends TestSuite {
   )
 
   val projectsMap = projects.map(p => p.moduleVersion -> p.copy(configurations = MavenRepository.defaultConfigurations)).toMap
-  val testRepository = new TestRepository(projectsMap)
+  val testRepository = TestRepository(projectsMap)
 
   val repositories = Seq[Repository](
     testRepository
diff --git a/tests/shared/src/test/scala/coursier/test/TestRepository.scala b/tests/shared/src/test/scala/coursier/test/TestRepository.scala
index bc851b8e1..f1d355ee9 100644
--- a/tests/shared/src/test/scala/coursier/test/TestRepository.scala
+++ b/tests/shared/src/test/scala/coursier/test/TestRepository.scala
@@ -6,7 +6,7 @@ import coursier.core._
 import scalaz.{ Monad, EitherT }
 import scalaz.Scalaz._
 
-class TestRepository(projects: Map[(Module, String), Project]) extends Repository {
+case class TestRepository(projects: Map[(Module, String), Project]) extends Repository {
   val source = new core.Artifact.Source {
     def artifacts(
       dependency: Dependency,