diff --git a/js/deribit.js b/js/deribit.js
index 6c8861659fcc0..b5fffa2d2c059 100644
--- a/js/deribit.js
+++ b/js/deribit.js
@@ -535,8 +535,8 @@ module.exports = class deribit extends Exchange {
         const currencyId = this.safeString (balance, 'currency');
         const currencyCode = this.safeCurrencyCode (currencyId);
         const account = this.account ();
-        account['free'] = this.safeString (balance, 'availableFunds');
-        account['used'] = this.safeString (balance, 'maintenanceMargin');
+        account['free'] = this.safeString (balance, 'available_funds');
+        account['used'] = this.safeString (balance, 'maintenance_margin') + this.safeString (balance, 'initial_margin');
         account['total'] = this.safeString (balance, 'equity');
         result[currencyCode] = account;
         return this.parseBalance (result, false);