diff --git a/milli/Cargo.toml b/milli/Cargo.toml
index ce3070e5d..bc1d9b7ee 100644
--- a/milli/Cargo.toml
+++ b/milli/Cargo.toml
@@ -21,7 +21,7 @@ charabia = { version = "0.8.1", default-features = false }
 concat-arrays = "0.1.2"
 crossbeam-channel = "0.5.8"
 deserr = "0.5.0"
-either = "1.8.1"
+either = { version = "1.8.1", features = ["serde"] }
 flatten-serde-json = { path = "../flatten-serde-json" }
 fst = "0.4.7"
 fxhash = "0.2.1"