diff --git a/packages/ra-ui-materialui/src/layout/Layout.js b/packages/ra-ui-materialui/src/layout/Layout.js
index 53ffa823405..81290d781ed 100644
--- a/packages/ra-ui-materialui/src/layout/Layout.js
+++ b/packages/ra-ui-materialui/src/layout/Layout.js
@@ -40,6 +40,7 @@ const styles = theme => ({
         display: 'flex',
         flexDirection: 'column',
         flexGrow: 1,
+        flexBasis: 0,
         padding: theme.spacing.unit * 3,
         [theme.breakpoints.up('xs')]: {
             paddingLeft: 5,