diff --git a/main/actions/Sync.scala b/main/actions/Sync.scala
index 39a9cb34e..7cab7453d 100644
--- a/main/actions/Sync.scala
+++ b/main/actions/Sync.scala
@@ -59,7 +59,7 @@ object Sync
 	def noDuplicateTargets(relation: Relation[File, File])
 	{
 		val dups = relation.reverseMap.filter { case (target, srcs) =>
-			srcs.size >= 2 && srcs.forall(_.isDirectory)
+			srcs.size >= 2 && srcs.exists(!_.isDirectory)
 		} map { case (target, srcs) =>
 			"\n\t" + target + "\nfrom\n\t" + srcs.mkString("\n\t\t")
 		}
@@ -88,4 +88,4 @@ object Sync
 		IO.gzipFileIn(file) { in =>
 			read[RelationInfo[F]](in)
 		}
-}
\ No newline at end of file
+}