diff --git a/plonky2/Cargo.toml b/plonky2/Cargo.toml
index db81fab0..6df46060 100644
--- a/plonky2/Cargo.toml
+++ b/plonky2/Cargo.toml
@@ -34,6 +34,9 @@ serde = { version = "1.0", default-features = false, features = ["derive"] }
 static_assertions = { version = "1.1.0", default-features = false }
 unroll = { version = "0.1.5", default-features = false }
 
+[target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
+getrandom = { version = "0.2", default-features = false, features = ["js"] }
+
 [dev-dependencies]
 criterion = { version = "0.4.0", default-features = false }
 env_logger = { version = "0.9.0", default-features = false }