diff --git a/rust-runtime/aws-smithy-checksums/src/lib.rs b/rust-runtime/aws-smithy-checksums/src/lib.rs
index 98ed65d34c..3c652258cd 100644
--- a/rust-runtime/aws-smithy-checksums/src/lib.rs
+++ b/rust-runtime/aws-smithy-checksums/src/lib.rs
@@ -82,7 +82,7 @@ impl ChecksumAlgorithm {
     }
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub enum Error {
     UnknownChecksumAlgorithm(String),
 }