diff --git a/crates/ruma/Cargo.toml b/crates/ruma/Cargo.toml
index de506884..22c0a97c 100644
--- a/crates/ruma/Cargo.toml
+++ b/crates/ruma/Cargo.toml
@@ -106,6 +106,7 @@ unstable-exhaustive-types = [
     "ruma-push-gateway-api/unstable-exhaustive-types",
     "ruma-state-res/unstable-exhaustive-types"
 ]
+unstable-pdu = ["ruma-events/unstable-pdu"]
 unstable-pre-spec = [
     "ruma-common/unstable-pre-spec",
     "ruma-client-api/unstable-pre-spec",