diff --git a/src/x509.rs b/src/x509.rs
index 0f8c0fd..9590fe6 100644
--- a/src/x509.rs
+++ b/src/x509.rs
@@ -6,7 +6,6 @@
 use crate::objects::*;
 use crate::traits::FromDer;
 
-use data_encoding::HEXUPPER;
 use der_parser::ber::{parse_ber_integer, BitStringObject, MAX_OBJECT_SIZE};
 use der_parser::der::*;
 use der_parser::error::*;
@@ -365,7 +364,7 @@ fn attribute_value_to_string(attr: &DerObject, _attr_type: &Oid) -> Result<Strin
         _ => {
             // type is not a string, get slice and convert it to base64
             attr.as_slice()
-                .map(|s| HEXUPPER.encode(s))
+                .map(|s| base64::encode(s))
                 .or(Err(X509Error::InvalidX509Name))
         }
     }