diff --git a/main/src/main/scala/sbt/internal/Aggregation.scala b/main/src/main/scala/sbt/internal/Aggregation.scala
index b5c3f811b..bdde24c48 100644
--- a/main/src/main/scala/sbt/internal/Aggregation.scala
+++ b/main/src/main/scala/sbt/internal/Aggregation.scala
@@ -52,8 +52,8 @@ object Aggregation {
       display: Show[ScopedKey[?]]
   ): Unit =
     xs match {
-      case KeyValue(_, x: Seq[?]) :: Nil => print(x.mkString("* ", "\n* ", ""))
-      case KeyValue(_, x) :: Nil         => print(x.toString)
+      case Seq(KeyValue(_, x: Seq[?])) => print(x.mkString("* ", "\n* ", ""))
+      case Seq(KeyValue(_, x))         => print(x.toString)
       case _ =>
         xs foreach { kv =>
           print(display.show(kv.key))