diff --git a/crates/red_knot_python_semantic/Cargo.toml b/crates/red_knot_python_semantic/Cargo.toml
index e7af108fe0..e024e234de 100644
--- a/crates/red_knot_python_semantic/Cargo.toml
+++ b/crates/red_knot_python_semantic/Cargo.toml
@@ -57,7 +57,7 @@ quickcheck = { version = "1.0.3", default-features = false }
 quickcheck_macros = { version = "1.0.0" }
 
 [features]
-serde = ["ruff_db/serde", "dep:serde"]
+serde = ["ruff_db/serde", "dep:serde", "ruff_python_ast/serde"]
 
 [lints]
 workspace = true