diff --git a/api/libs/rsa.py b/api/libs/rsa.py
index da279eb32..ed7a0eb11 100644
--- a/api/libs/rsa.py
+++ b/api/libs/rsa.py
@@ -1,4 +1,5 @@
 import hashlib
+import os
 from typing import Union
 
 from Crypto.Cipher import AES
@@ -17,7 +18,7 @@ def generate_key_pair(tenant_id: str) -> str:
     pem_private = private_key.export_key()
     pem_public = public_key.export_key()
 
-    filepath = "privkeys/{tenant_id}".format(tenant_id=tenant_id) + "/private.pem"
+    filepath = os.path.join("privkeys", tenant_id, "private.pem")
 
     storage.save(filepath, pem_private)
 
@@ -47,7 +48,7 @@ def encrypt(text: str, public_key: Union[str, bytes]) -> bytes:
 
 
 def get_decrypt_decoding(tenant_id: str) -> tuple[RSA.RsaKey, object]:
-    filepath = "privkeys/{tenant_id}".format(tenant_id=tenant_id) + "/private.pem"
+    filepath = os.path.join("privkeys", tenant_id, "private.pem")
 
     cache_key = "tenant_privkey:{hash}".format(hash=hashlib.sha3_256(filepath.encode()).hexdigest())
     private_key = redis_client.get(cache_key)