diff --git a/src/crew.gleam b/src/crew.gleam
index 45cfa10..c458509 100644
--- a/src/crew.gleam
+++ b/src/crew.gleam
@@ -466,12 +466,16 @@ pub fn select_map(
 /// This function should be called when you're done using a channel obtained
 /// from `subscribe`. It stops any in-progress work for this channel and
 /// removes the channel's handlers from the selector.
+///
+/// Any finished work that is still coming in is dropped.
 pub fn unsubscribe(
   channel: Channel(a),
   selector: Selector(msg),
 ) -> Selector(msg) {
-  actor.send(channel.pool, Unsubscribe(channel.receive))
+  let unsubscribed = process.new_subject()
+  actor.send(channel.pool, Unsubscribe(channel.receive, unsubscribed:))
 
+  wait_for_unsubscribe(channel, unsubscribed)
   process.demonitor_process(channel.monitor)
 
   selector
@@ -479,6 +483,23 @@ pub fn unsubscribe(
   |> process.deselect(channel.receive)
 }
 
+fn wait_for_unsubscribe(channel: Channel(a), unsubscribed: Subject(b)) -> Nil {
+  let unsubscribe_selector =
+    process.new_selector()
+    |> process.select_map(unsubscribed, fn(_) { True })
+    |> process.select_specific_monitor(channel.monitor, fn(_) { True })
+    |> process.select_map(channel.receive, fn(_) { False })
+
+  drop_messages_loop(unsubscribe_selector)
+}
+
+fn drop_messages_loop(selector: Selector(Bool)) -> Nil {
+  case process.selector_receive_forever(selector) {
+    True -> Nil
+    False -> drop_messages_loop(selector)
+  }
+}
+
 /// Submit a single piece of work to the pool using a subscription channel.
 ///
 /// This is a lower-level function for submitting work. Results must be handled
@@ -505,7 +526,7 @@ pub opaque type PoolMsg {
   MonitoredProcessExited(reason: process.Down)
   //
   Subscribe(receive: Subject(WorkResult))
-  Unsubscribe(receive: Subject(WorkResult))
+  Unsubscribe(receive: Subject(WorkResult), unsubscribed: Subject(Nil))
   Enqueue(receive: Subject(WorkResult), work: List(fn() -> Any))
 }
 
@@ -655,7 +676,7 @@ fn pool(state: State, msg: PoolMsg) -> Next(State, PoolMsg) {
       State(..state, callers:, requests:)
     }
 
-    Unsubscribe(receive:) -> {
+    Unsubscribe(receive:, unsubscribed:) -> {
       use request <- try_(dict.get(state.requests, receive), state)
 
       let requests = dict.delete(state.requests, receive)
@@ -679,6 +700,8 @@ fn pool(state: State, msg: PoolMsg) -> Next(State, PoolMsg) {
         }
       }
 
+      process.send(unsubscribed, Nil)
+
       State(..state, requests:, callers:)
     }
   }