diff --git a/core/src/main/scala/cats/Invariant.scala b/core/src/main/scala/cats/Invariant.scala
index b293df5a7f..dcb92ec121 100644
--- a/core/src/main/scala/cats/Invariant.scala
+++ b/core/src/main/scala/cats/Invariant.scala
@@ -70,7 +70,7 @@ object Invariant extends ScalaVersionSpecificInvariantInstances with InvariantIn
   implicit def catsFlatMapForMap[K]: FlatMap[Map[K, *]] = cats.instances.map.catsStdInstancesForMap[K]
   implicit def catsFlatMapForSortedMap[K]: FlatMap[SortedMap[K, *]] =
     cats.instances.sortedMap.catsStdInstancesForSortedMap[K]
-  implicit def catsBimonadForFunction0[I]: Bimonad[Function0] = cats.instances.function.catsStdBimonadForFunction0
+  implicit def catsBimonadForFunction0: Bimonad[Function0] = cats.instances.function.catsStdBimonadForFunction0
   implicit def catsMonadForFunction1[I]: Monad[I => *] = cats.instances.function.catsStdMonadForFunction1[I]
   implicit def catsContravariantMonoidalForFunction1[R: Monoid]: ContravariantMonoidal[* => R] =
     cats.instances.function.catsStdContravariantMonoidalForFunction1[R]