diff --git a/src/utils.ts b/src/utils.ts
index d5e4e51..6ec8c94 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -192,7 +192,6 @@ export type Cipher = {
   encrypt(plaintext: Uint8Array): Uint8Array;
   decrypt(ciphertext: Uint8Array): Uint8Array;
 };
-export type OneTimeCipher = Cipher;
 
 export type AsyncCipher = {
   encrypt(plaintext: Uint8Array): Promise<Uint8Array>;