diff --git a/FrancescoPicasso/mimikatz.py b/FrancescoPicasso/mimikatz.py
index 08fb680..320f4fb 100644
--- a/FrancescoPicasso/mimikatz.py
+++ b/FrancescoPicasso/mimikatz.py
@@ -179,18 +179,18 @@ class LsaDecryptor():
   MSSK_TAG = 0x4d53534b
 
   HARD_KEY = construct.Struct('KIWI_HARD_KEY',
-      construct.ULInt32('cbSecret'),
+      construct.Int32ul('cbSecret'),
       construct.Field('data', lambda ctx: ctx.cbSecret))
 
   # Modified to include HARD_KEY size.
   BCRYPT_KEY = construct.Struct('KIWI_BCRYPT_KEY',
-      construct.ULInt32('size'),
-      construct.ULInt32('tag'), # 'MSSK'.
-      construct.ULInt32('type'),
-      construct.ULInt32('unk0'),
-      construct.ULInt32('unk1'),
-      construct.ULInt32('unk2'),
-      construct.ULInt32('cbSecret'))
+      construct.Int32ul('size'),
+      construct.Int32ul('tag'), # 'MSSK'.
+      construct.Int32ul('type'),
+      construct.Int32ul('unk0'),
+      construct.Int32ul('unk1'),
+      construct.Int32ul('unk2'),
+      construct.Int32ul('cbSecret'))
 
   def __init__(self):
     self.iv = ''
@@ -225,7 +225,7 @@ def get_key(self, pos, key_offset):
             if data:
               kbk = self.BCRYPT_KEY.parse(data)
               if kbk.tag == self.MSSK_TAG:
-                adjust = construct.ULInt32('').sizeof()
+                adjust = construct.Int32ul('').sizeof()
                 size = kbk.cbSecret + adjust
                 ptr_key = ptr_key + self.BCRYPT_KEY.sizeof() - adjust
                 data = self.get_data(ptr_key, size)
@@ -311,11 +311,11 @@ class LsaDecryptor_Vista_x86(LsaDecryptor_x86):
   PTR_DES_KEY_OFFSET = -70;
 
   BCRYPT_HANDLE_KEY = construct.Struct('KIWI_BCRYPT_HANDLE_KEY',
-      construct.ULInt32('size'),
-      construct.ULInt32('tag'), # Tag 'UUUR', 0x55555552.
-      construct.ULInt32('ptr_void_algorithm'),
-      construct.ULInt32('ptr_kiwi_bcrypt_key'),
-      construct.ULInt32('ptr_unknown'))
+      construct.Int32ul('size'),
+      construct.Int32ul('tag'), # Tag 'UUUR', 0x55555552.
+      construct.Int32ul('ptr_void_algorithm'),
+      construct.Int32ul('ptr_kiwi_bcrypt_key'),
+      construct.Int32ul('ptr_unknown'))
   
   def __init__(self, lsass_task):
     LsaDecryptor_x86.__init__(self, lsass_task)
@@ -330,11 +330,11 @@ class LsaDecryptor_Win7_x86(LsaDecryptor_x86):
   PTR_DES_KEY_OFFSET = -70;
 
   BCRYPT_HANDLE_KEY = construct.Struct('KIWI_BCRYPT_HANDLE_KEY',
-      construct.ULInt32('size'),
-      construct.ULInt32('tag'), # Tag 'UUUR', 0x55555552.
-      construct.ULInt32('ptr_void_algorithm'),
-      construct.ULInt32('ptr_kiwi_bcrypt_key'),
-      construct.ULInt32('ptr_unknown'))
+      construct.Int32ul('size'),
+      construct.Int32ul('tag'), # Tag 'UUUR', 0x55555552.
+      construct.Int32ul('ptr_void_algorithm'),
+      construct.Int32ul('ptr_kiwi_bcrypt_key'),
+      construct.Int32ul('ptr_unknown'))
   
   def __init__(self, lsass_task):
     LsaDecryptor_x86.__init__(self, lsass_task)
@@ -348,11 +348,11 @@ class LsaDecryptor_Vista_x64(LsaDecryptor_x64):
   PTR_DES_KEY_OFFSET = -69;
 
   BCRYPT_HANDLE_KEY = construct.Struct('KIWI_BCRYPT_HANDLE_KEY',
-      construct.ULInt32('size'),
-      construct.ULInt32('tag'), # Tag 'UUUR', 0x55555552.
-      construct.ULInt64('ptr_void_algorithm'),
-      construct.ULInt64('ptr_kiwi_bcrypt_key'),
-      construct.ULInt64('ptr_unknown'))
+      construct.Int32ul('size'),
+      construct.Int32ul('tag'), # Tag 'UUUR', 0x55555552.
+      construct.Int64ul('ptr_void_algorithm'),
+      construct.Int64ul('ptr_kiwi_bcrypt_key'),
+      construct.Int64ul('ptr_unknown'))
   
   def __init__(self, lsass_task):
     LsaDecryptor_x64.__init__(self, lsass_task)
@@ -367,11 +367,11 @@ class LsaDecryptor_Win7_x64(LsaDecryptor_x64):
   PTR_DES_KEY_OFFSET = -61;
 
   BCRYPT_HANDLE_KEY = construct.Struct('KIWI_BCRYPT_HANDLE_KEY',
-      construct.ULInt32('size'),
-      construct.ULInt32('tag'), # Tag 'UUUR', 0x55555552.
-      construct.ULInt64('ptr_void_algorithm'),
-      construct.ULInt64('ptr_kiwi_bcrypt_key'),
-      construct.ULInt64('ptr_unknown'))
+      construct.Int32ul('size'),
+      construct.Int32ul('tag'), # Tag 'UUUR', 0x55555552.
+      construct.Int64ul('ptr_void_algorithm'),
+      construct.Int64ul('ptr_kiwi_bcrypt_key'),
+      construct.Int64ul('ptr_unknown'))
   
   def __init__(self, lsass_task):
     LsaDecryptor_x64.__init__(self, lsass_task)
@@ -474,21 +474,21 @@ class Wdigest_x86(Wdigest, Mimikatz_x86):
   """TODO: add description."""
 
   WDIGEST_LIST_ENTRY = construct.Struct('WdigestListEntry',
-      construct.ULInt32('previous'),
-      construct.ULInt32('next'),
-      construct.ULInt32('usage_count'),
-      construct.ULInt32('this_entry'),
-      construct.ULInt64('luid'),
-      construct.ULInt64('flag'),
-      construct.ULInt16('user_len'),
-      construct.ULInt16('user_max_len'),
-      construct.ULInt32('user_string_ptr'),
-      construct.ULInt16('domain_len'),
-      construct.ULInt16('domain_max_len'),
-      construct.ULInt32('domain_string_ptr'),
-      construct.ULInt16('password_len'),
-      construct.ULInt16('password_max_len'),
-      construct.ULInt32('password_encrypted_ptr'))
+      construct.Int32ul('previous'),
+      construct.Int32ul('next'),
+      construct.Int32ul('usage_count'),
+      construct.Int32ul('this_entry'),
+      construct.Int64ul('luid'),
+      construct.Int64ul('flag'),
+      construct.Int16ul('user_len'),
+      construct.Int16ul('user_max_len'),
+      construct.Int32ul('user_string_ptr'),
+      construct.Int16ul('domain_len'),
+      construct.Int16ul('domain_max_len'),
+      construct.Int32ul('domain_string_ptr'),
+      construct.Int16ul('password_len'),
+      construct.Int16ul('password_max_len'),
+      construct.Int32ul('password_encrypted_ptr'))
   
   def __init__(self, lsass_task, credentials_obj):
     Mimikatz_x86.__init__(self, lsass_task)
@@ -499,25 +499,25 @@ class Wdigest_x64(Wdigest, Mimikatz_x64):
   """TODO: add description."""
 
   WDIGEST_LIST_ENTRY = construct.Struct('WdigestListEntry',
-      construct.ULInt64('previous'),
-      construct.ULInt64('next'),
-      construct.ULInt32('usage_count'),
-      construct.ULInt32('align1'),
-      construct.ULInt64('this_entry'),
-      construct.ULInt64('luid'),
-      construct.ULInt64('flag'),
-      construct.ULInt16('user_len'),
-      construct.ULInt16('user_max_len'),
-      construct.ULInt32('align2'),
-      construct.ULInt64('user_string_ptr'),
-      construct.ULInt16('domain_len'),
-      construct.ULInt16('domain_max_len'),
-      construct.ULInt32('align3'),
-      construct.ULInt64('domain_string_ptr'),
-      construct.ULInt16('password_len'),
-      construct.ULInt16('password_max_len'),
-      construct.ULInt32('align4'),
-      construct.ULInt64('password_encrypted_ptr'))
+      construct.Int64ul('previous'),
+      construct.Int64ul('next'),
+      construct.Int32ul('usage_count'),
+      construct.Int32ul('align1'),
+      construct.Int64ul('this_entry'),
+      construct.Int64ul('luid'),
+      construct.Int64ul('flag'),
+      construct.Int16ul('user_len'),
+      construct.Int16ul('user_max_len'),
+      construct.Int32ul('align2'),
+      construct.Int64ul('user_string_ptr'),
+      construct.Int16ul('domain_len'),
+      construct.Int16ul('domain_max_len'),
+      construct.Int32ul('align3'),
+      construct.Int64ul('domain_string_ptr'),
+      construct.Int16ul('password_len'),
+      construct.Int16ul('password_max_len'),
+      construct.Int32ul('align4'),
+      construct.Int64ul('password_encrypted_ptr'))
   
   def __init__(self, lsass_task, credentials_obj):
     Mimikatz_x64.__init__(self, lsass_task)