diff --git a/play-mailer-guice/src/test/scala/play/api/libs/mailer/ConfigModule.scala b/play-mailer-guice/src/test/scala/play/api/libs/mailer/ConfigModule.scala
index f918bfd6..76995105 100644
--- a/play-mailer-guice/src/test/scala/play/api/libs/mailer/ConfigModule.scala
+++ b/play-mailer-guice/src/test/scala/play/api/libs/mailer/ConfigModule.scala
@@ -9,7 +9,7 @@ import play.api.{ Configuration, Environment }
  */
 class ConfigModule extends Module {
 
-  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[_]] = Seq(
+  override def bindings(environment: Environment, configuration: Configuration): Seq[Binding[?]] = Seq(
     bind[Config].toInstance(configuration.underlying)
   )
 
diff --git a/play-mailer-guice/src/test/scala/play/api/libs/mailer/MailerPluginGuiceSpec.scala b/play-mailer-guice/src/test/scala/play/api/libs/mailer/MailerPluginGuiceSpec.scala
index 9617ccc3..872eb394 100644
--- a/play-mailer-guice/src/test/scala/play/api/libs/mailer/MailerPluginGuiceSpec.scala
+++ b/play-mailer-guice/src/test/scala/play/api/libs/mailer/MailerPluginGuiceSpec.scala
@@ -17,7 +17,7 @@ class MailerPluginGuiceSpec extends Specification {
     val mockedConfigurationProvider = mock(classOf[SMTPConfigurationProvider])
     when(mockedConfigurationProvider.get()).thenReturn(SMTPConfiguration("example.org", 25, mock = true))
 
-    def createApp(additionalConfiguration: Map[String, _]): Application = {
+    def createApp(additionalConfiguration: Map[String, ?]): Application = {
       new GuiceApplicationBuilder()
         .configure(additionalConfiguration)
         .overrides(new ConfigModule) // Play 2.5.x "hack"