diff --git a/crates/roc_std/Cargo.lock b/crates/roc_std/Cargo.lock
index 910f82f4f0..b220750a33 100644
--- a/crates/roc_std/Cargo.lock
+++ b/crates/roc_std/Cargo.lock
@@ -205,9 +205,16 @@ dependencies = [
  "pretty_assertions",
  "quickcheck",
  "quickcheck_macros",
+ "serde",
  "static_assertions",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.143"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53e8e5d5b70924f74ff5c6d64d9a5acd91422117c60f48c4e07855238a254553"
+
 [[package]]
 name = "static_assertions"
 version = "1.1.0"
diff --git a/crates/roc_std/Cargo.toml b/crates/roc_std/Cargo.toml
index b8d8ec4538..ae63756bcb 100644
--- a/crates/roc_std/Cargo.toml
+++ b/crates/roc_std/Cargo.toml
@@ -11,6 +11,7 @@ version = "0.0.1"
 [dependencies]
 static_assertions = "1.1.0"
 arrayvec = "0.7.2"
+serde = { version = "1", optional = true }
 
 [dev-dependencies]
 indoc = "1.0.3"
@@ -21,3 +22,4 @@ libc = "0.2.106"
 
 [features]
 std = []
+serde = ["dep:serde"]