diff --git a/wasm/lib/Cargo.toml b/wasm/lib/Cargo.toml
index 9c78a02904..cb227a8b47 100644
--- a/wasm/lib/Cargo.toml
+++ b/wasm/lib/Cargo.toml
@@ -10,6 +10,10 @@ edition = "2018"
 [lib]
 crate-type = ["cdylib", "rlib"]
 
+[features]
+default = ["freeze-stdlib"]
+freeze-stdlib = ["rustpython-vm/freeze-stdlib"]
+
 [dependencies]
 rustpython-compiler = { path = "../../compiler" }
 rustpython-parser = { path = "../../parser" }