diff --git a/std/shared/src/main/scala/cats/effect/std/PQueue.scala b/std/shared/src/main/scala/cats/effect/std/PQueue.scala
index 23284c8257..a8f1864950 100644
--- a/std/shared/src/main/scala/cats/effect/std/PQueue.scala
+++ b/std/shared/src/main/scala/cats/effect/std/PQueue.scala
@@ -59,7 +59,7 @@ object PQueue {
     assertNonNegative(capacity)
     F.ref(State.empty[F, A]).map { ref =>
       new PQueueImpl[F, A](ref, capacity) {
-        implicit val Ord = O
+        implicit val Ord: Order[A] = O
       }
     }
   }
diff --git a/std/shared/src/main/scala/cats/effect/std/internal/BinomialHeap.scala b/std/shared/src/main/scala/cats/effect/std/internal/BinomialHeap.scala
index 32102b3cb7..ce61b7e41a 100644
--- a/std/shared/src/main/scala/cats/effect/std/internal/BinomialHeap.scala
+++ b/std/shared/src/main/scala/cats/effect/std/internal/BinomialHeap.scala
@@ -66,7 +66,7 @@ private[std] object BinomialHeap {
 
   def apply[A](trees: List[BinomialTree[A]])(implicit ord: Order[A]) =
     new BinomialHeap[A](trees) {
-      implicit val Ord = ord
+      implicit val Ord: Order[A] = ord
     }
 
   /**