diff --git a/SignalServiceKit/src/Contacts/OWSContactDiscoveryOperation.swift b/SignalServiceKit/src/Contacts/OWSContactDiscoveryOperation.swift
index df4ac48dc..6d64bd720 100644
--- a/SignalServiceKit/src/Contacts/OWSContactDiscoveryOperation.swift
+++ b/SignalServiceKit/src/Contacts/OWSContactDiscoveryOperation.swift
@@ -393,7 +393,7 @@ class CDSBatchOperation: OWSOperation {
         let initializationVector = try params.requiredBase64EncodedData(key: "iv")
         let authTag = try params.requiredBase64EncodedData(key: "mac")
 
-        guard let plainText = Cryptography.decryptAESGCM(withInitializationVector: initializationVector,
+        guard let plainText = Cryptography.decryptAESCGM(withInitializationVector: initializationVector,
                                                          ciphertext: cipherText,
                                                          additionalAuthenticatedData: nil,
                                                          authTag: authTag,
diff --git a/SignalServiceKit/src/Util/OWSError.h b/SignalServiceKit/src/Util/OWSError.h
index a67b9b138..729683f08 100644
--- a/SignalServiceKit/src/Util/OWSError.h
+++ b/SignalServiceKit/src/Util/OWSError.h
@@ -16,6 +16,7 @@ typedef NS_ENUM(NSInteger, OWSErrorCode) {
     OWSErrorCodeUntrustedIdentity = 25,
     OWSErrorCodeFailedToSendOutgoingMessage = 30,
     OWSErrorCodeAssertionFailure = 31,
+    OWSErrorCodeFailedToDecryptMessage = 100,
     OWSErrorCodeFailedToEncryptMessage = 110,
     OWSErrorCodeSignalServiceFailure = 1001,
     OWSErrorCodeSignalServiceRateLimited = 1010,