diff --git a/vortex-array/src/compute/filter.rs b/vortex-array/src/compute/filter.rs
index 7839594538..8c82baa7c0 100644
--- a/vortex-array/src/compute/filter.rs
+++ b/vortex-array/src/compute/filter.rs
@@ -264,11 +264,6 @@ impl FilterMask {
         self.range_selectivity
     }
 
-    /// Get the canonical representation of the mask as a [BoolArray].
-    pub fn to_bool_array(&self) -> VortexResult<BoolArray> {
-        Ok(BoolArray::from(self.boolean_buffer()?.clone()))
-    }
-
     /// Get the canonical representation of the mask.
     pub fn to_boolean_buffer(&self) -> VortexResult<BooleanBuffer> {
         log::debug!(
@@ -291,7 +286,7 @@ impl FilterMask {
         })
     }
 
-    pub(crate) fn indices(&self) -> VortexResult<&[usize]> {
+    fn indices(&self) -> VortexResult<&[usize]> {
         self.indices
             .get_or_try_init(|| {
                 let mut indices = Vec::with_capacity(self.true_count());