diff --git a/aws-lc-rs/src/rsa/key.rs b/aws-lc-rs/src/rsa/key.rs
index 5d7dca53bf1..690c1544278 100644
--- a/aws-lc-rs/src/rsa/key.rs
+++ b/aws-lc-rs/src/rsa/key.rs
@@ -430,6 +430,7 @@ where
     }
 }
 
+#[cfg(feature = "ring-io")]
 impl From<&PublicKey> for PublicKeyComponents<&[u8]> {
     fn from(public_key: &PublicKey) -> Self {
         PublicKeyComponents {