diff --git a/src/aleph/sdk/client/vm_client.py b/src/aleph/sdk/client/vm_client.py
index 5ab22a0b..18d280cc 100644
--- a/src/aleph/sdk/client/vm_client.py
+++ b/src/aleph/sdk/client/vm_client.py
@@ -35,7 +35,7 @@ def __init__(
     ):
         self.account = account
         self.ephemeral_key = jwk.JWK.generate(kty="EC", crv="P-256")
-        self.node_url = node_url.rstrip('/')
+        self.node_url = node_url.rstrip("/")
         self.pubkey_payload = self._generate_pubkey_payload()
         self.pubkey_signature_header = ""
         self.session = session or aiohttp.ClientSession()