diff --git a/vortex-serde/src/layouts/reader/projections.rs b/vortex-serde/src/layouts/reader/projections.rs
index 0e2edf7564..7b45f1166d 100644
--- a/vortex-serde/src/layouts/reader/projections.rs
+++ b/vortex-serde/src/layouts/reader/projections.rs
@@ -9,13 +9,6 @@ impl Projection {
     pub fn new(indices: impl AsRef<[usize]>) -> Self {
         Self::Partial(Vec::from(indices.as_ref()))
     }
-
-    pub fn contains_idx(&self, idx: usize) -> bool {
-        match self {
-            Projection::All => true,
-            Projection::Partial(idxs) => idxs.contains(&idx),
-        }
-    }
 }
 
 impl From<Vec<usize>> for Projection {