diff --git a/argh_shared/Cargo.toml b/argh_shared/Cargo.toml
index 8e07308..0305ecf 100644
--- a/argh_shared/Cargo.toml
+++ b/argh_shared/Cargo.toml
@@ -9,4 +9,4 @@ repository = "https://github.com/google/argh"
 readme = "README.md"
 
 [dependencies]
-serde = { version = "1", features = ["derive"] }
+serde = { version = "1", default-features = false, features = ["derive", "alloc"] }