diff --git a/schemars_derive/Cargo.toml b/schemars_derive/Cargo.toml
index 2a8c5fd..88c9b81 100644
--- a/schemars_derive/Cargo.toml
+++ b/schemars_derive/Cargo.toml
@@ -14,9 +14,8 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "0.4"
 quote = "0.6.13"
-syn = "0.15.44"
+syn = { version = "0.15.44", features = ["extra-traits"] }
 serde_derive_internals = "0.24.1"
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"
-syn = { version = "0.15.44", features = ["extra-traits"] }