diff --git a/lnbits/core/views/wallet_api.py b/lnbits/core/views/wallet_api.py
index 1a484a1b4..e0f663b2c 100644
--- a/lnbits/core/views/wallet_api.py
+++ b/lnbits/core/views/wallet_api.py
@@ -66,7 +66,7 @@ async def api_update_wallet(
     if not wallet:
         raise HTTPException(status_code=HTTPStatus.NOT_FOUND, detail="Wallet not found")
     wallet.name = name or wallet.name
-    wallet.currency = currency or wallet.currency
+    wallet.currency = currency if currency is not None else wallet.currency
     await update_wallet(wallet)
     return wallet