diff --git a/src/expr/core/src/window_function/range.rs b/src/expr/core/src/window_function/range.rs
index ebc2f5ef2d4b4..922e247dd8369 100644
--- a/src/expr/core/src/window_function/range.rs
+++ b/src/expr/core/src/window_function/range.rs
@@ -366,7 +366,7 @@ impl Deref for RangeFrameOffset {
 
 #[derive(Debug, Educe)]
 #[educe(Clone, Copy)]
-pub struct RangeFrameOffsetRef<'a> {
+struct RangeFrameOffsetRef<'a> {
     /// Built expression for `$0 + offset`.
     add_expr: &'a dyn Expression,
     /// Built expression for `$0 - offset`.