diff --git a/google-common/src/test/scala/akka/stream/alpakka/google/auth/OAuth2CredentialsSpec.scala b/google-common/src/test/scala/akka/stream/alpakka/google/auth/OAuth2CredentialsSpec.scala
index 6e7629bac0..dfb6d50be9 100644
--- a/google-common/src/test/scala/akka/stream/alpakka/google/auth/OAuth2CredentialsSpec.scala
+++ b/google-common/src/test/scala/akka/stream/alpakka/google/auth/OAuth2CredentialsSpec.scala
@@ -42,7 +42,7 @@ class OAuth2CredentialsSpec
   }
 
   val testableCredentials = new OAuth2Credentials("dummyProject") {
-    override protected def getAccessToken()(@unused implicit mat: Materializer,
+    override protected def getAccessToken()(implicit @unused mat: Materializer,
                                             @unused settings: RequestSettings,
                                             @unused clock: Clock): Future[AccessToken] =
       AccessTokenProvider.accessTokenPromise.future