diff --git a/crates/ruma/Cargo.toml b/crates/ruma/Cargo.toml
index 44ce167b..9b2bde01 100644
--- a/crates/ruma/Cargo.toml
+++ b/crates/ruma/Cargo.toml
@@ -49,6 +49,7 @@ state-res = ["ruma-state-res"]
 client-ext-client-api = ["client", "ruma-client/client-api"]
 client-hyper = ["client", "ruma-client/hyper"]
 client-hyper-native-tls = ["client", "ruma-client/hyper-native-tls"]
+client-isahc = ["client", "ruma-client/isahc"]
 client-reqwest = ["client", "ruma-client/reqwest"]
 client-reqwest-native-tls = ["client", "ruma-client/reqwest-native-tls"]
 client-reqwest-native-tls-vendored = ["client", "ruma-client/reqwest-native-tls-vendored"]