diff --git a/library/src/scala/runtime/DynamicTuple.scala b/library/src/scala/runtime/DynamicTuple.scala
index 031b36a4eefd..ae75f133a5c1 100644
--- a/library/src/scala/runtime/DynamicTuple.scala
+++ b/library/src/scala/runtime/DynamicTuple.scala
@@ -212,8 +212,8 @@ object DynamicTuple {
 
   def dynamicConcat[This <: Tuple, That <: Tuple](self: This, that: That): Concat[This, That] = {
     type Result = Concat[This, That]
-    (this: Any) match {
-      case self: Unit => return self.asInstanceOf[Result]
+    (self: Any) match {
+      case self: Unit => return that.asInstanceOf[Result]
       case _ =>
     }
     (that: Any) match {
diff --git a/tests/run/tuple-concat.check b/tests/run/tuple-concat.check
new file mode 100644
index 000000000000..32888b26a398
--- /dev/null
+++ b/tests/run/tuple-concat.check
@@ -0,0 +1,5 @@
+tuple1 ++ emptyTuple = (e1,e2,e3)
+emptyTuple ++ tuple1 = (e1,e2,e3)
+tuple2 ++ emptyTuple = (e4,e5,e6)
+emptyTuple ++ tuple2 = (e4,e5,e6)
+tuple1 ++ tuple2 = (e1,e2,e3,e4,e5,e6)
diff --git a/tests/run/tuple-concat.scala b/tests/run/tuple-concat.scala
new file mode 100644
index 000000000000..86b6e428f2c9
--- /dev/null
+++ b/tests/run/tuple-concat.scala
@@ -0,0 +1,15 @@
+
+object Test extends App {
+  val emptyTuple: Tuple = ()
+  val tuple1: Tuple = "e1" *: "e2" *: "e3" *: ()
+  val tuple2: Tuple = "e4" *: "e5" *: "e6" *: ()
+  val result: Tuple = "e1" *: "e2" *: "e3" *: "e4" *: "e5" *: "e6" *: ()
+
+  println("tuple1 ++ emptyTuple = " + (tuple1 ++ emptyTuple))
+  println("emptyTuple ++ tuple1 = " + (emptyTuple ++ tuple1))
+  println("tuple2 ++ emptyTuple = " + (tuple2 ++ emptyTuple))
+  println("emptyTuple ++ tuple2 = " + (emptyTuple ++ tuple2))
+  println("tuple1 ++ tuple2 = " + (tuple1 ++ tuple2))
+  assert((tuple1 ++ emptyTuple).asInstanceOf[AnyRef] eq tuple1.asInstanceOf[AnyRef])
+  assert((emptyTuple ++tuple1).asInstanceOf[AnyRef] eq tuple1.asInstanceOf[AnyRef])
+}