diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/Consumer.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/Consumer.scala
index 480994af..70fe937c 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/Consumer.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/Consumer.scala
@@ -289,6 +289,7 @@ object Consumer {
                 rebalanceListener.onPartitionsAssigned(consumer, assigned)
               )
               .getOrThrowFiberFailure()
+              .run()
           }
         }
 
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/EventLoop.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/EventLoop.scala
index d5aaa3b5..7c81308e 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/EventLoop.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/EventLoop.scala
@@ -222,8 +222,10 @@ object EventLoop {
           } yield delayedRebalanceEffect
         }
 
-        override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[Any] =
-          partitionsAssigned.succeed(partitions)
+        override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+          implicit trace: Trace
+        ): UIO[DelayedRebalanceEffect] =
+          partitionsAssigned.succeed(partitions).as(DelayedRebalanceEffect.unit)
       }
   }
 
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListener.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListener.scala
index e08433ca..00bfd8cf 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListener.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListener.scala
@@ -5,7 +5,7 @@ import zio.{Tag, Trace, UIO, URIO, ZEnvironment, ZIO, ZLayer}
 
 trait RebalanceListener[-R] { self =>
   def onPartitionsRevoked(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[R, DelayedRebalanceEffect]
-  def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[R, Any]
+  def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[R, DelayedRebalanceEffect]
 
   def *>[R1](other: RebalanceListener[R1]) = new RebalanceListener[R with R1] {
     override def onPartitionsRevoked(consumer: Consumer, partitions: Set[TopicPartition])(
@@ -16,7 +16,9 @@ trait RebalanceListener[-R] { self =>
         ef2 <- other.onPartitionsRevoked(consumer, partitions)
       } yield ef1 *> ef2
 
-    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[R with R1, Any] =
+    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+      implicit trace: Trace
+    ): URIO[R with R1, DelayedRebalanceEffect] =
       self.onPartitionsAssigned(consumer, partitions) *> other.onPartitionsAssigned(consumer, partitions)
   }
 
@@ -25,7 +27,9 @@ trait RebalanceListener[-R] { self =>
       implicit trace: Trace
     ): URIO[Any, DelayedRebalanceEffect] =
       self.onPartitionsRevoked(consumer, partitions).provide(ZLayer.succeed(r))
-    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[Any, Any] =
+    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+      implicit trace: Trace
+    ): URIO[Any, DelayedRebalanceEffect] =
       self.onPartitionsAssigned(consumer, partitions).provide(ZLayer.succeed(r))
   }
 
@@ -34,7 +38,9 @@ trait RebalanceListener[-R] { self =>
       implicit trace: Trace
     ): URIO[Any, DelayedRebalanceEffect] =
       self.onPartitionsRevoked(consumer, partitions).provideEnvironment(r)
-    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[Any, Any] =
+    override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+      implicit trace: Trace
+    ): URIO[Any, DelayedRebalanceEffect] =
       self.onPartitionsAssigned(consumer, partitions).provideEnvironment(r)
   }
 }
@@ -89,8 +95,10 @@ object RebalanceListener {
         implicit trace: Trace
       ): URIO[R, DelayedRebalanceEffect] =
         onRevoked(consumer, partitions).as(DelayedRebalanceEffect.unit)
-      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[R, Any] =
-        onAssigned(consumer, partitions)
+      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+        implicit trace: Trace
+      ): URIO[R, DelayedRebalanceEffect] =
+        onAssigned(consumer, partitions).as(DelayedRebalanceEffect.unit)
     }
 
   def apply(
@@ -102,8 +110,9 @@ object RebalanceListener {
         implicit trace: Trace
       ): UIO[DelayedRebalanceEffect] =
         onRevoked(partitions).as(DelayedRebalanceEffect.unit)
-      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[Any] = onAssigned(
-        partitions
-      )
+      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+        implicit trace: Trace
+      ): UIO[DelayedRebalanceEffect] =
+        onAssigned(partitions).as(DelayedRebalanceEffect.unit)
     }
 }
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RecordConsumer.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RecordConsumer.scala
index 19c05ee1..9ea37db3 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RecordConsumer.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/RecordConsumer.scala
@@ -168,12 +168,12 @@ object RecordConsumer {
 
                                       override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
                                         implicit trace: Trace
-                                      ): URIO[R1, Any] =
+                                      ): URIO[R1, DelayedRebalanceEffect] =
                                         for {
                                           allAssigned <- assigned.updateAndGet(_ => partitions)
                                           _           <- consumerSubscriptionRef.set(subscription)
                                           _           <- promise.succeed(allAssigned)
-                                        } yield ()
+                                        } yield DelayedRebalanceEffect.unit
                                     }
 
               _                 <- subscribe[R1](subscription, rebalanceListener)(consumer)
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/ReportingConsumer.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/ReportingConsumer.scala
index d6f122a8..8a260a9a 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/ReportingConsumer.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/ReportingConsumer.scala
@@ -50,7 +50,7 @@ case class ReportingConsumer(clientId: ClientId, group: Group, internal: Consume
             }
             .map(_._2)).provideEnvironment(r)
 
-      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[Any] =
+      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[DelayedRebalanceEffect] =
         (report(PartitionsAssigned(clientId, group, partitions, config.consumerAttributes)) *>
           rebalanceListener.onPartitionsAssigned(consumer, partitions)).provideEnvironment(r)
     }
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchConsumer.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchConsumer.scala
index 053439a6..3d92e85a 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchConsumer.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchConsumer.scala
@@ -91,12 +91,12 @@ object BatchConsumer {
 
                                  override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
                                    implicit trace: Trace
-                                 ): URIO[R1, Any] =
+                                 ): URIO[R1, DelayedRebalanceEffect] =
                                    for {
                                      allAssigned <- assigned.updateAndGet(_ => partitions)
                                      _           <- consumerSubscriptionRef.set(subscription)
                                      _           <- promise.succeed(allAssigned)
-                                   } yield ()
+                                   } yield DelayedRebalanceEffect.unit
                                }
         _                 <- subscribe[R1](subscription, rebalanceListener)(consumer)
         resubscribeTimeout = config.resubscribeTimeout
@@ -157,8 +157,10 @@ object BatchConsumer {
       ): URIO[Any, DelayedRebalanceEffect] =
         assignments.update(_ -- partitions).as(DelayedRebalanceEffect.unit)
 
-      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): URIO[Any, Any] =
-        assignments.update(_ ++ partitions)
+      override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
+        implicit trace: Trace
+      ): URIO[Any, DelayedRebalanceEffect] =
+        assignments.update(_ ++ partitions).as(DelayedRebalanceEffect.unit)
     }
   }
 }
diff --git a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchEventLoop.scala b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchEventLoop.scala
index 02c3564c..b166fbf4 100644
--- a/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchEventLoop.scala
+++ b/core/src/main/scala/com/wixpress/dst/greyhound/core/consumer/batched/BatchEventLoop.scala
@@ -243,8 +243,8 @@ object BatchEventLoop {
           state.partitionsRevoked(partitions).as(DelayedRebalanceEffect.unit)
         }
 
-        override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[Any] =
-          partitionsAssigned.succeed(())
+        override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(implicit trace: Trace): UIO[DelayedRebalanceEffect] =
+          partitionsAssigned.succeed(()).as(DelayedRebalanceEffect.unit)
       }
   }
 
diff --git a/core/src/test/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListenerTest.scala b/core/src/test/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListenerTest.scala
index d1ad0e44..3e028df3 100644
--- a/core/src/test/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListenerTest.scala
+++ b/core/src/test/scala/com/wixpress/dst/greyhound/core/consumer/RebalanceListenerTest.scala
@@ -24,8 +24,8 @@ class RebalanceListenerTest extends JUnitRunnableSpec {
                            log(s"$id.revoke $partitions").as(DelayedRebalanceEffect(unsafeLog(s"$id.revoke.tle $partitions")))
                          override def onPartitionsAssigned(consumer: Consumer, partitions: Set[TopicPartition])(
                            implicit trace: Trace
-                         ): URIO[Any, Any] =
-                           log(s"$id.assigned $partitions")
+                         ): URIO[Any, DelayedRebalanceEffect] =
+                           log(s"$id.assigned $partitions").as(DelayedRebalanceEffect(unsafeLog(s"$id.assigned.tle $partitions")))
                        }
         l1l2       = listener("l1") *> listener("l2")
         partitions = Set(TopicPartition("topic", 0))