diff --git a/packages/mui-base/src/utils/useAnchorPositioning.ts b/packages/mui-base/src/utils/useAnchorPositioning.ts
index b5d468fa5f..fd2e76b81d 100644
--- a/packages/mui-base/src/utils/useAnchorPositioning.ts
+++ b/packages/mui-base/src/utils/useAnchorPositioning.ts
@@ -80,7 +80,7 @@ export function useAnchorPositioning(
     collisionBoundary,
     collisionPadding = 5,
     hideWhenDetached = false,
-    fallbackAxisSideDirection = 'start',
+    fallbackAxisSideDirection = 'none',
     sticky = false,
     keepMounted = false,
     arrowPadding = 5,