diff --git a/util/appmacro/src/main/scala/sbt/appmacro/KListBuilder.scala b/util/appmacro/src/main/scala/sbt/appmacro/KListBuilder.scala
index 195123c6c..c22825c1b 100644
--- a/util/appmacro/src/main/scala/sbt/appmacro/KListBuilder.scala
+++ b/util/appmacro/src/main/scala/sbt/appmacro/KListBuilder.scala
@@ -60,7 +60,7 @@ object KListBuilder extends TupleBuilder
 		val representationC = PolyType(tcVariable :: Nil, klistType)
 		val resultType = appliedType(representationC, idTC :: Nil)
 		val input = klist
-		val alistInstance = TypeApply(select(Ident(alist), "klist"), TypeTree(representationC) :: Nil)
+		val alistInstance: ctx.universe.Tree = TypeApply(select(Ident(alist), "klist"), TypeTree(representationC) :: Nil)
 		def extract(param: ValDef) = bindKList(param, Nil, inputs.map(_.local))
 	}
 }
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