diff --git a/crates/ruma/Cargo.toml b/crates/ruma/Cargo.toml
index 22c0a97c..dfa12080 100644
--- a/crates/ruma/Cargo.toml
+++ b/crates/ruma/Cargo.toml
@@ -112,6 +112,7 @@ unstable-pre-spec = [
     "ruma-client-api/unstable-pre-spec",
     "ruma-events/unstable-pre-spec",
     "ruma-federation-api/unstable-pre-spec",
+    "ruma-identifiers/unstable-pre-spec",
     "ruma-state-res/unstable-pre-spec"
     #"ruma-identity-service-api/unstable-pre-spec",
     #"ruma-push-gateway-api/unstable-pre-spec",