diff --git a/crates/ruma-client-api/Cargo.toml b/crates/ruma-client-api/Cargo.toml
index e126f761..2657128d 100644
--- a/crates/ruma-client-api/Cargo.toml
+++ b/crates/ruma-client-api/Cargo.toml
@@ -37,6 +37,7 @@ matches = "0.1.8"
 [features]
 compat = []
 unstable-exhaustive-types = []
-unstable-pre-spec = []
+# feature dependency required for r0::room::create_room::CreationContent::into_event_content
+unstable-pre-spec = ["ruma-events/unstable-pre-spec"]
 client = []
 server = []