diff --git a/src/error-code.hpp b/src/error-code.hpp
index d1908f1..5ccf820 100644
--- a/src/error-code.hpp
+++ b/src/error-code.hpp
@@ -33,7 +33,8 @@
   UnsupportedEncryptionScheme = 32,
   InvalidEncryptedFormat = 33,
   NoDecryptKey = 34,
-  EncryptionFailure = 35
+  EncryptionFailure = 35,
+  DataRetrievalFailure = 36
 };
 
 typedef function<void (const ErrorCode&, const std::string&)> ErrorCallBack;