diff --git a/crates/dav/src/xml/error.rs b/crates/dav/src/xml/error.rs
index 2f24858..8dc5afc 100644
--- a/crates/dav/src/xml/error.rs
+++ b/crates/dav/src/xml/error.rs
@@ -3,10 +3,10 @@ use rustical_xml::{XmlRootTag, XmlSerialize};
 #[derive(XmlSerialize, XmlRootTag)]
 #[xml(ns = "crate::namespace::NS_DAV", root = b"error")]
 #[xml(ns_prefix(
-    crate::namespace::NS_DAV = b"",
-    crate::namespace::NS_CARDDAV = b"CARD",
-    crate::namespace::NS_CALDAV = b"CAL",
-    crate::namespace::NS_CALENDARSERVER = b"CS",
-    crate::namespace::NS_DAVPUSH = b"PUSH"
+    crate::namespace::NS_DAV = "",
+    crate::namespace::NS_CARDDAV = "CARD",
+    crate::namespace::NS_CALDAV = "CAL",
+    crate::namespace::NS_CALENDARSERVER = "CS",
+    crate::namespace::NS_DAVPUSH = "PUSH"
 ))]
 pub struct ErrorElement<'t, T: XmlSerialize>(#[xml(ty = "untagged")] pub &'t T);
diff --git a/crates/dav/src/xml/multistatus.rs b/crates/dav/src/xml/multistatus.rs
index 7349f2c..19c9f73 100644
--- a/crates/dav/src/xml/multistatus.rs
+++ b/crates/dav/src/xml/multistatus.rs
@@ -42,11 +42,11 @@ pub enum PropstatWrapper<T: XmlSerialize> {
 #[derive(XmlSerialize, XmlRootTag)]
 #[xml(ns = "crate::namespace::NS_DAV", root = b"response")]
 #[xml(ns_prefix(
-    crate::namespace::NS_DAV = b"",
-    crate::namespace::NS_CARDDAV = b"CARD",
-    crate::namespace::NS_CALDAV = b"CAL",
-    crate::namespace::NS_CALENDARSERVER = b"CS",
-    crate::namespace::NS_DAVPUSH = b"PUSH"
+    crate::namespace::NS_DAV = "",
+    crate::namespace::NS_CARDDAV = "CARD",
+    crate::namespace::NS_CALDAV = "CAL",
+    crate::namespace::NS_CALENDARSERVER = "CS",
+    crate::namespace::NS_DAVPUSH = "PUSH"
 ))]
 pub struct ResponseElement<PropstatType: XmlSerialize> {
     pub href: String,
@@ -88,11 +88,11 @@ impl<PT: XmlSerialize> Default for ResponseElement<PT> {
 #[derive(XmlSerialize, XmlRootTag)]
 #[xml(root = b"multistatus", ns = "crate::namespace::NS_DAV")]
 #[xml(ns_prefix(
-    crate::namespace::NS_DAV = b"",
-    crate::namespace::NS_CARDDAV = b"CARD",
-    crate::namespace::NS_CALDAV = b"CAL",
-    crate::namespace::NS_CALENDARSERVER = b"CS",
-    crate::namespace::NS_DAVPUSH = b"PUSH"
+    crate::namespace::NS_DAV = "",
+    crate::namespace::NS_CARDDAV = "CARD",
+    crate::namespace::NS_CALDAV = "CAL",
+    crate::namespace::NS_CALENDARSERVER = "CS",
+    crate::namespace::NS_DAVPUSH = "PUSH"
 ))]
 pub struct MultistatusElement<PropType: XmlSerialize, MemberPropType: XmlSerialize> {
     #[xml(rename = b"response", flatten)]
diff --git a/crates/dav_push/src/lib.rs b/crates/dav_push/src/lib.rs
index d18a64c..a0dd196 100644
--- a/crates/dav_push/src/lib.rs
+++ b/crates/dav_push/src/lib.rs
@@ -27,8 +27,8 @@ pub struct ContentUpdate {
 #[derive(XmlSerialize, XmlRootTag, Debug)]
 #[xml(root = b"push-message", ns = "rustical_dav::namespace::NS_DAVPUSH")]
 #[xml(ns_prefix(
-    rustical_dav::namespace::NS_DAVPUSH = b"",
-    rustical_dav::namespace::NS_DAV = b"D",
+    rustical_dav::namespace::NS_DAVPUSH = "",
+    rustical_dav::namespace::NS_DAV = "D",
 ))]
 struct PushMessage {
     #[xml(ns = "rustical_dav::namespace::NS_DAVPUSH")]
diff --git a/crates/xml/derive/src/attrs.rs b/crates/xml/derive/src/attrs.rs
index 0d4cc11..7695173 100644
--- a/crates/xml/derive/src/attrs.rs
+++ b/crates/xml/derive/src/attrs.rs
@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 
 use darling::{FromDeriveInput, FromField, FromMeta, FromVariant, util::Flag};
-use syn::{Ident, LitByteStr};
+use syn::{Ident, LitByteStr, LitStr};
 
 #[derive(Debug, Default, FromMeta, Clone)]
 pub struct TagAttrs {
@@ -33,7 +33,7 @@ pub struct StructAttrs {
     pub root: Option<LitByteStr>,
     pub ns: Option<syn::Path>,
     #[darling(default)]
-    pub ns_prefix: HashMap<syn::Path, LitByteStr>,
+    pub ns_prefix: HashMap<syn::Path, LitStr>,
     pub allow_invalid: Flag,
 }
 
diff --git a/crates/xml/derive/src/xml_struct/impl_se.rs b/crates/xml/derive/src/xml_struct/impl_se.rs
index 0df2bf6..ec5c651 100644
--- a/crates/xml/derive/src/xml_struct/impl_se.rs
+++ b/crates/xml/derive/src/xml_struct/impl_se.rs
@@ -75,7 +75,7 @@ impl NamedStruct {
                     } else {
                         b"".to_vec()
                     };
-                    let attr_name = [b"xmlns".as_ref(), &sep, &prefix.value()].concat();
+                    let attr_name = [b"xmlns".as_ref(), &sep, prefix.value().as_bytes()].concat();
                     let a = syn::LitByteStr::new(&attr_name, prefix.span());
                     quote! {
                          bytes_start.push_attribute((#a.as_ref(), #ns.as_ref()));