diff --git a/src/components/radio.js b/src/components/radio.js
index 71c08e2..7851fd5 100644
--- a/src/components/radio.js
+++ b/src/components/radio.js
@@ -18,6 +18,7 @@ module.exports = function ({ addComponents, theme }) {
       borderRadius: "50%",
       float: "left",
       flex: "none",
+      background: "transparent" /* for old Safari */,
     },
     ".ds-radio + label": {
       position: "relative",