diff --git a/openssl/src/hash.rs b/openssl/src/hash.rs
index 77e0a2c5..52d2ca09 100644
--- a/openssl/src/hash.rs
+++ b/openssl/src/hash.rs
@@ -16,7 +16,7 @@ cfg_if! {
     }
 }
 
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, PartialEq, Eq)]
 pub struct MessageDigest(*const ffi::EVP_MD);
 
 impl MessageDigest {