diff --git a/crates/typst-syntax/Cargo.toml b/crates/typst-syntax/Cargo.toml
index 928635c4..684e5fb2 100644
--- a/crates/typst-syntax/Cargo.toml
+++ b/crates/typst-syntax/Cargo.toml
@@ -17,7 +17,7 @@ bench = false
 
 [dependencies]
 comemo = "0.3"
-ecow = "0.1.1"
+ecow = { version = "0.1.1", features = ["serde"] }
 once_cell = "1"
 serde = { version = "1", features = ["derive"] }
 tracing = "0.1.37"