diff --git a/halo2_proofs/src/circuit/value.rs b/halo2_proofs/src/circuit/value.rs
index 920b70d330..ca31dffda9 100644
--- a/halo2_proofs/src/circuit/value.rs
+++ b/halo2_proofs/src/circuit/value.rs
@@ -14,8 +14,7 @@ use crate::plonk::{Assigned, Error};
 ///   for improved usability.
 #[derive(Clone, Copy, Debug)]
 pub struct Value<V> {
-    /// for adhoc usage...
-    pub inner: Option<V>,
+    inner: Option<V>,
 }
 
 impl<V> Default for Value<V> {