diff --git a/modules/deriving/src/test/scala/shapeless3/deriving/instances.scala b/modules/deriving/src/test/scala/shapeless3/deriving/instances.scala
index 592ce0d..080b436 100644
--- a/modules/deriving/src/test/scala/shapeless3/deriving/instances.scala
+++ b/modules/deriving/src/test/scala/shapeless3/deriving/instances.scala
@@ -63,7 +63,7 @@ class InstancesTests:
 
   @Test
   def mapKforSingle: Unit =
-    val inst = summon[K0.Instances[TypeClass, Single[Int]]]
+    val inst = summon[K0.ProductInstances[TypeClass, Single[Int]]]
     val otherInst = inst.mapK([t] => (tc: TypeClass[t]) => tc.another)
     val s = Single(42)