diff --git a/donpapi/lib/dpapi.py b/donpapi/lib/dpapi.py
index f950177..9355c25 100644
--- a/donpapi/lib/dpapi.py
+++ b/donpapi/lib/dpapi.py
@@ -160,7 +160,7 @@ class DPAPI:
 				# Assume MD4
 				key1 = HMAC.new(pwdhash.encode('utf-16le'), (sid + '\0').encode('utf-16le'), SHA1).digest()
 				# For Protected users
-				tmpKey = pbkdf2_hmac('sha256', pwdhash, sid.encode('utf-16le'), 10000)
+				tmpKey = pbkdf2_hmac('sha256', pwdhash.encode('utf-16le'), sid.encode('utf-16le'), 10000)
 				tmpKey2 = pbkdf2_hmac('sha256', tmpKey, sid.encode('utf-16le'), 1)[:16]
 				key2 = HMAC.new(tmpKey2, (sid + '\0').encode('utf-16le'), SHA1).digest()[:20]
 		except Exception as e: