diff --git a/modules/cache-material/src/build_cryptographic_materials_cache_key_helpers.ts b/modules/cache-material/src/build_cryptographic_materials_cache_key_helpers.ts
index fc411f64..380324c9 100644
--- a/modules/cache-material/src/build_cryptographic_materials_cache_key_helpers.ts
+++ b/modules/cache-material/src/build_cryptographic_materials_cache_key_helpers.ts
@@ -15,9 +15,6 @@ import {
 } from '@aws-crypto/serialize'
 import { compare } from './portable_compare'
 
-//  512 bits of 0 for padding between hashes in decryption materials cache ID generation.
-const BIT_PAD_512 = Buffer.alloc(64)
-
 export function buildCryptographicMaterialsCacheKeyHelpers<
   S extends SupportedAlgorithmSuites
 >(
@@ -25,6 +22,8 @@ export function buildCryptographicMaterialsCacheKeyHelpers<
   toUtf8: (input: Uint8Array) => string,
   sha512: (...data: (Uint8Array | string)[]) => Promise<Uint8Array>
 ): CryptographicMaterialsCacheKeyHelpersInterface<S> {
+  //  512 bits of 0 for padding between hashes in decryption materials cache ID generation.
+  const BIT_PAD_512 = Buffer.alloc(64)
   const sorting: SerializeOptions = { utf8Sorting: true }
   const { serializeEncryptionContext, serializeEncryptedDataKey } =
     serializeFactory(fromUtf8, sorting)
diff --git a/package-lock.json b/package-lock.json
index 6a4bf439..16310b41 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -415,6 +415,7 @@
         "@types/stream-to-promise": "^2.2.0",
         "@types/yargs": "^17.0.1",
         "buffer": "^6.0.3",
+        "end-of-stream": "<=1.4.4",
         "got": "^11.8.0",
         "jasmine-core": "^3.5.0",
         "karma": "^6.3.4",