diff --git a/crates/ruff_python_formatter/Cargo.toml b/crates/ruff_python_formatter/Cargo.toml
index 2e2a6501972e6..14e2ed5c846d1 100644
--- a/crates/ruff_python_formatter/Cargo.toml
+++ b/crates/ruff_python_formatter/Cargo.toml
@@ -52,6 +52,6 @@ test = true
 required-features = ["serde"]
 
 [features]
+default = ["serde"]
 serde = ["dep:serde", "ruff_formatter/serde", "ruff_source_file/serde", "ruff_python_ast/serde"]
 schemars = ["dep:schemars", "ruff_formatter/schemars"]
-default = []