diff --git a/mikro.py b/mikro.py
index 44736f4..5cede9a 100644
--- a/mikro.py
+++ b/mikro.py
@@ -39,8 +39,8 @@ def mikro_softwareid_encode(id:int)->str:
   assert(isinstance(id, int))
   ret = ''
   for i in range(8):
-    ret += chr(SOFTWARE_ID_CHARACTER_TABLE[id % 0x23])
-    id //= 0x23
+    ret += chr(SOFTWARE_ID_CHARACTER_TABLE[id % len(SOFTWARE_ID_CHARACTER_TABLE)])
+    id //= len(SOFTWARE_ID_CHARACTER_TABLE)
     if i == 3:
       ret += '-'
   return ret
@@ -205,4 +205,4 @@ def mikro_kcdsa_verify(data:bytes, signature:bytes, public_key:bytes)->bool:
         nonce = int((public_key * signature + curve.G * data_hash).x) 
         if mikro_sha256(Tools.inttobytes_le(nonce,32))[:len(nonce_hash)] == nonce_hash:
             return True
-    return False
\ No newline at end of file
+    return False