diff --git a/vendor/assets/stylesheets/franceconnect.css b/vendor/assets/stylesheets/franceconnect.scss
similarity index 97%
rename from vendor/assets/stylesheets/franceconnect.css
rename to vendor/assets/stylesheets/franceconnect.scss
index bf8fd73a9..892aaf840 100644
--- a/vendor/assets/stylesheets/franceconnect.css
+++ b/vendor/assets/stylesheets/franceconnect.scss
@@ -44,7 +44,7 @@
     color: #ffffff;
     margin-right: 10px;
     font-size: 18px;
-    background: url('logo_mini_FC.png') left center no-repeat;
+    background: image-url('logo_mini_FC.png') left center no-repeat;
     background-size: 40px;
 }