diff --git a/ui/app/pages/swaps/swaps-gas-customization-modal/swaps-gas-customization-modal.component.js b/ui/app/pages/swaps/swaps-gas-customization-modal/swaps-gas-customization-modal.component.js
index 53b4583dd..1347529dc 100644
--- a/ui/app/pages/swaps/swaps-gas-customization-modal/swaps-gas-customization-modal.component.js
+++ b/ui/app/pages/swaps/swaps-gas-customization-modal/swaps-gas-customization-modal.component.js
@@ -35,7 +35,7 @@ export default class GasModalPageContainer extends Component {
     disableSave: PropTypes.bool,
     customGasLimitMessage: PropTypes.string,
     customTotalSupplement: PropTypes.string,
-    usdConversionRate: PropTypes.string,
+    usdConversionRate: PropTypes.number,
     customGasPrice: PropTypes.string,
     customGasLimit: PropTypes.string,
     setSwapsCustomizationModalPrice: PropTypes.func,