diff --git a/packages/ra-ui-materialui/src/auth/Login.js b/packages/ra-ui-materialui/src/auth/Login.js
index b9f025460ed..1f11147f7cc 100644
--- a/packages/ra-ui-materialui/src/auth/Login.js
+++ b/packages/ra-ui-materialui/src/auth/Login.js
@@ -81,7 +81,7 @@ class Login extends Component {
         const { backgroundImage } = this.props;
         const img = new Image();
         img.onload = () => {
-            this.containerRef.current.style.background = `url(${backgroundImage})`;
+            this.containerRef.current.style.backgroundImage = `url(${backgroundImage})`;
         };
         img.src = backgroundImage;
     }