diff --git a/rust_crypto_provider/Cargo.toml b/rust_crypto_provider/Cargo.toml
index fd2fdc8..358ecab 100644
--- a/rust_crypto_provider/Cargo.toml
+++ b/rust_crypto_provider/Cargo.toml
@@ -28,7 +28,7 @@ criterion = { version = "0.5", features = ["html_reports"] }
 rand = { version = "0.8" }
 
 [features]
-deterministic-prng = [] # ⚠️ FOR TESTING ONLY.
+deterministic-prng = ["hpke-rs-crypto/std"] # ⚠️ FOR TESTING ONLY.
 
 [[bench]]
 name = "bench_hkdf"