diff --git a/Cargo.lock b/Cargo.lock
index 3de8004..8e504bf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1239,6 +1239,7 @@ dependencies = [
  "rutster-call-model",
  "str0m",
  "thiserror 1.0.69",
+ "tokio",
  "tracing",
 ]
 
diff --git a/crates/rutster-media/Cargo.toml b/crates/rutster-media/Cargo.toml
index fd096bd..950ed1e 100644
--- a/crates/rutster-media/Cargo.toml
+++ b/crates/rutster-media/Cargo.toml
@@ -13,5 +13,13 @@ opus = { workspace = true }
 str0m = { workspace = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }
+# tokio: required at lib-compile time because `Reflex<P>` owns a
+# `tokio::sync::mpsc::Receiver<AdvisoryEvent>` (the advisory channel the
+# TapEngine feeds from its tokio task). rutster-media proper makes NO
+# tokio runtime calls — the dedicated media thread drives `Reflex`, not a
+# tokio executor (ARCHITECTURE.md "dedicated timing threads, not the
+# shared tokio pool" — see slice-1 spec §3.4). The `full` features here
+# also cover `#[tokio::test]` + `#[tokio::main]` in the binary/tests.
+tokio = { workspace = true }
 
 [dev-dependencies]