1 files changed, 2 insertions, 0 deletions
diff --git a/src/library/scala/collection/mutable/Builder.scala b/src/library/scala/collection/mutable/Builder.scala
index 44cc1c8582..bbf4f5889d 100644
--- a/src/library/scala/collection/mutable/Builder.scala
+++ b/src/library/scala/collection/mutable/Builder.scala
@@ -100,6 +100,8 @@ trait Builder[-Elem, +To] extends Growable[Elem] {
       def +=(x: Elem): this.type = { self += x; this }
       def clear() = self.clear()
       override def ++=(xs: TraversableOnce[Elem]): this.type = { self ++= xs; this }
+      override def sizeHint(size: Int) = self.sizeHint(size)
+      override def sizeHintBounded(size: Int, boundColl: TraversableLike[_, _]) = self.sizeHintBounded(size, boundColl)
       def result: NewTo = f(self.result)
     }
 }