diff --git a/Cargo.toml b/Cargo.toml
index c33af7f..67dbe16 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,15 +9,16 @@ license = "MIT"
 name = "etcd"
 readme = "README.md"
 repository = "https://github.com/jimmycuadra/rust-etcd"
-version = "0.5.1"
-
-[build-dependencies]
-syntex = "0.31.0"
+version = "0.5.2"
 
 [build-dependencies.serde_codegen]
 optional = true
 version = "0.7.2"
 
+[build-dependencies.syntex]
+optional = true
+version = "0.31.0"
+
 [dependencies]
 hyper = "0.8.1"
 openssl = "0.7.9"
@@ -30,5 +31,5 @@ optional = true
 version = "0.7.2"
 
 [features]
-default = ["serde_codegen"]
+default = ["serde_codegen", "syntex"]
 nightly = ["serde_macros"]