diff --git a/crates/ruma-events-macros/Cargo.toml b/crates/ruma-events-macros/Cargo.toml
index b83e5d29..6c7c3c41 100644
--- a/crates/ruma-events-macros/Cargo.toml
+++ b/crates/ruma-events-macros/Cargo.toml
@@ -19,7 +19,7 @@ version = "0.22.0-alpha.3"
 proc-macro-crate = "1.0.0"
 proc-macro2 = "1.0.24"
 quote = "1.0.8"
-syn = { version = "1.0.57", features = ["full"] }
+syn = { version = "1.0.57", features = ["extra-traits", "full"] }
 
 [lib]
 proc-macro = true