diff --git a/crates/ruma/Cargo.toml b/crates/ruma/Cargo.toml
index 1537f826..42d26f3d 100644
--- a/crates/ruma/Cargo.toml
+++ b/crates/ruma/Cargo.toml
@@ -63,6 +63,7 @@ markdown = ["ruma-events/markdown"]
 full = [
     "api",
     "client",
+    "client-ext-client-api",
     "events",
     "signatures",
     "state-res",