diff --git a/xmpp/Cargo.toml b/xmpp/Cargo.toml
index 55489c93..3553e9b0 100644
--- a/xmpp/Cargo.toml
+++ b/xmpp/Cargo.toml
@@ -35,3 +35,4 @@ default = ["avatars", "starttls-rust"]
 starttls-native = ["tokio-xmpp/starttls", "tokio-xmpp/tls-native", "reqwest/native-tls"]
 starttls-rust = ["tokio-xmpp/starttls", "tokio-xmpp/tls-rust", "reqwest/rustls-tls"]
 avatars = []
+syntax-highlighting = [ "tokio-xmpp/syntax-highlighting" ]