diff --git a/plugin/src/main/scala-2.10/coursier/FromSbt.scala b/plugin/src/main/scala-2.10/coursier/FromSbt.scala
index 0152cd1a3..a17bad9c8 100644
--- a/plugin/src/main/scala-2.10/coursier/FromSbt.scala
+++ b/plugin/src/main/scala-2.10/coursier/FromSbt.scala
@@ -80,7 +80,7 @@ object FromSbt {
         }
 
     for {
-      (from, to) <- allMappings.toSeq
+      (from, to) <- allMappings
       attr <- attributes
     } yield from -> dep.copy(configuration = to, attributes = attr)
   }