diff --git a/Cargo.toml b/Cargo.toml
index 3518d6e..61479ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,4 +22,5 @@ travis-ci = { repository = "alexcrichton/toml-rs" }
 serde = "1.0"
 
 [dev-dependencies]
+serde_derive = "1.0"
 serde_json = "1.0"