diff --git a/src/mantine-core/src/components/Button/Button.module.css b/src/mantine-core/src/components/Button/Button.module.css
index 18d5a175e68..e59085f01c8 100644
--- a/src/mantine-core/src/components/Button/Button.module.css
+++ b/src/mantine-core/src/components/Button/Button.module.css
@@ -85,7 +85,7 @@
       content: '';
       position: absolute;
       inset: rem(-1px);
-      border-radius: var(--button-radius);
+      border-radius: var(--button-radius, var(--mantine-radius-default));
       background-color: var(--_button-loading-overlay-bg);
     }
   }