diff --git a/packages/material-ui/src/Button/Button.js b/packages/material-ui/src/Button/Button.js
index e2975546eb90b1..cff9278f002aee 100644
--- a/packages/material-ui/src/Button/Button.js
+++ b/packages/material-ui/src/Button/Button.js
@@ -39,6 +39,7 @@ export const styles = theme => ({
   },
   /* Styles applied to the span element that wraps the children. */
   label: {
+    width: '100%', // assure the correct width for iOS Safari
     display: 'inherit',
     alignItems: 'inherit',
     justifyContent: 'inherit',