diff --git a/src/name.rs b/src/name.rs
index 59498e86..ab4eeaa6 100644
--- a/src/name.rs
+++ b/src/name.rs
@@ -493,15 +493,11 @@ impl NamespaceResolver {
                     }
                     Some(PrefixDeclaration::Named(prefix)) => {
                         let start = buffer.len();
+                        let ns = Namespace(&v);
 
-                        if v == RESERVED_NAMESPACE_XMLNS.1.into_inner() {
-                            // error, non-`xmlns` prefix set to xmlns uri
-                            return Err(Error::ReservedNamespaceError {
-                                prefix: String::from_utf8(prefix.to_vec()).unwrap(),
-                                name: String::from_utf8(v.to_vec()).unwrap(),
-                            });
-                        } else if v == RESERVED_NAMESPACE_XML.1.into_inner() {
+                        if ns == RESERVED_NAMESPACE_XML.1 || ns == RESERVED_NAMESPACE_XMLNS.1 {
                             // error, non-`xml` prefix set to xml uri
+                            // error, non-`xmlns` prefix set to xmlns uri
                             return Err(Error::ReservedNamespaceError {
                                 prefix: String::from_utf8(prefix.to_vec()).unwrap(),
                                 name: String::from_utf8(v.to_vec()).unwrap(),