diff --git a/curve25519-dalek/Cargo.toml b/curve25519-dalek/Cargo.toml
index 9570670..74054d4 100644
--- a/curve25519-dalek/Cargo.toml
+++ b/curve25519-dalek/Cargo.toml
@@ -71,7 +71,9 @@ cpufeatures = "0.2.6"
 fiat-crypto = { version = "0.2.1", default-features = false , optional = true}
 
 [features]
-default = ["alloc", "precomputed-tables", "zeroize"]
+auto-release = []
+warn-fallback = []
+default = ["alloc", "precomputed-tables", "zeroize", "auto-release", "warn-fallback"]
 alloc = ["zeroize?/alloc"]
 precomputed-tables = []
 legacy_compatibility = []