diff --git a/app/design/adminhtml/Magento/backend/web/css/source/variables/_spinner.less b/app/design/adminhtml/Magento/backend/web/css/source/variables/_spinner.less
index 09baf498cbcf4..60b84b1f467fe 100644
--- a/app/design/adminhtml/Magento/backend/web/css/source/variables/_spinner.less
+++ b/app/design/adminhtml/Magento/backend/web/css/source/variables/_spinner.less
@@ -26,4 +26,4 @@
 @spinner-rotate-step: 45;
 
 //  One step in degree
-@spinner-delay: .9;
+@spinner-delay: .9s;