--- a/lib/ssl/ssl3con.c
+++ b/lib/ssl/ssl3con.c
@@ -3076,17 +3076,17 @@ ssl3_CompressMACEncryptRecord(ssl3Cipher
         SSL3ProtocolVersion version = cwSpec->version;
 
         if (capRecordVersion || version >= SSL_LIBRARY_VERSION_TLS_1_3) {
             version = PR_MIN(SSL_LIBRARY_VERSION_TLS_1_0, version);
         }
 
         b = ssl_EncodeUintX(version, 2, b);
     }
-    b = ssl_EncodeUintX(cipherBytes, 2, b);
+    (void)ssl_EncodeUintX(cipherBytes, 2, b);
 
     ++cwSpec->write_seq_num;
 
     return SECSuccess;
 }
 
 /* Process the plain text before sending it.
  * Returns the number of bytes of plaintext that were successfully sent