diff --git a/monkey_island/cc/resources/telemetry.py b/monkey_island/cc/resources/telemetry.py
index 33a11fe58..6095b0946 100644
--- a/monkey_island/cc/resources/telemetry.py
+++ b/monkey_island/cc/resources/telemetry.py
@@ -211,7 +211,7 @@ class Telemetry(flask_restful.Resource):
             for field in ['password', 'lm_hash', 'ntlm_hash']:
                 credential = attempts[i][field]
                 if len(credential) > 0:
-                    attempts[i][field] = encryptor.enc(credential)
+                    attempts[i][field] = encryptor.enc(credential.encode('utf-8'))
 
 
 TELEM_PROCESS_DICT = \