diff --git a/cashu/wallet/wallet.py b/cashu/wallet/wallet.py
index 79c4cdc3..1401b22d 100644
--- a/cashu/wallet/wallet.py
+++ b/cashu/wallet/wallet.py
@@ -454,6 +454,7 @@ async def get_quote_ephemeral_keypair(self) -> Optional[Tuple[str, str]]:
             await self.load_mint_info()
         if self.mint_info.supports_mint_quote_signature():
             privkey = PrivateKey()
+            assert privkey.pubkey
             pubkey = privkey.pubkey.serialize(True).hex()
             return privkey.serialize(), pubkey
         else: