diff --git a/src/bytes.rs b/src/bytes.rs
index 1289961..18735a4 100644
--- a/src/bytes.rs
+++ b/src/bytes.rs
@@ -7,7 +7,7 @@ impl AsRef<[u8]> for Bytes {
     }
 }
 
-#[cfg(any(test, feature = "serde"))]
+#[cfg(feature = "serde")]
 pub mod serde {
     use super::*;
 
diff --git a/src/kzg/mod.rs b/src/kzg/mod.rs
index d405993..966679d 100644
--- a/src/kzg/mod.rs
+++ b/src/kzg/mod.rs
@@ -3,7 +3,7 @@ use crate::{blob, bls};
 mod poly;
 mod setup;
 
-#[cfg(test)]
+#[cfg(all(test, feature = "serde"))]
 mod spec;
 
 pub type Proof = bls::P1;