diff --git a/core/src/main/scala/cats/InjectK.scala b/core/src/main/scala/cats/InjectK.scala
index b2c76b99058..596bb7d0d9f 100644
--- a/core/src/main/scala/cats/InjectK.scala
+++ b/core/src/main/scala/cats/InjectK.scala
@@ -9,7 +9,7 @@ import cats.data.EitherK
  *
  * @see [[http://www.staff.science.uu.nl/~swier004/publications/2008-jfp.pdf]]
  */
-sealed abstract class InjectK[F[_], G[_]] {
+abstract class InjectK[F[_], G[_]] {
   def inj: FunctionK[F, G]
 
   def prj: FunctionK[G, λ[α => Option[F[α]]]]