diff --git a/crates/dav/src/resource/methods/proppatch.rs b/crates/dav/src/resource/methods/proppatch.rs
index 48ef887..77cf9b4 100644
--- a/crates/dav/src/resource/methods/proppatch.rs
+++ b/crates/dav/src/resource/methods/proppatch.rs
@@ -33,6 +33,7 @@ struct SetPropertyPropWrapperWrapper<T: XmlDeserialize> {
 // We are <set>
 #[derive(XmlDeserialize, Clone, Debug)]
 struct SetPropertyElement<T: XmlDeserialize> {
+    #[xml(ns = "crate::namespace::NS_DAV")]
     prop: T,
 }
 
@@ -50,17 +51,21 @@ struct PropertyElement {
 
 #[derive(XmlDeserialize, Clone, Debug)]
 struct RemovePropertyElement {
+    #[xml(ns = "crate::namespace::NS_DAV")]
     prop: PropertyElement,
 }
 
 #[derive(XmlDeserialize, Clone, Debug)]
 enum Operation<T: XmlDeserialize> {
+    #[xml(ns = "crate::namespace::NS_DAV")]
     Set(SetPropertyElement<T>),
+    #[xml(ns = "crate::namespace::NS_DAV")]
     Remove(RemovePropertyElement),
 }
 
 #[derive(XmlDeserialize, XmlRootTag, Clone, Debug)]
 #[xml(root = b"propertyupdate")]
+#[xml(ns = "crate::namespace::NS_DAV")]
 struct PropertyupdateElement<T: XmlDeserialize> {
     #[xml(ty = "untagged", flatten)]
     operations: Vec<Operation<T>>,
diff --git a/crates/dav/src/xml/multistatus.rs b/crates/dav/src/xml/multistatus.rs
index 9e5050a..dfbf673 100644
--- a/crates/dav/src/xml/multistatus.rs
+++ b/crates/dav/src/xml/multistatus.rs
@@ -88,7 +88,7 @@ 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"D",
+    crate::namespace::NS_DAV = b"",
     crate::namespace::NS_CARDDAV = b"CARD",
     crate::namespace::NS_CALDAV = b"CAL",
     crate::namespace::NS_CALENDARSERVER = b"CS"
diff --git a/crates/xml/derive/src/xml_struct.rs b/crates/xml/derive/src/xml_struct.rs
index a810040..dda345b 100644
--- a/crates/xml/derive/src/xml_struct.rs
+++ b/crates/xml/derive/src/xml_struct.rs
@@ -248,7 +248,12 @@ impl NamedStruct {
                 .ns_prefix
                 .iter()
                 .map(|(ns, prefix)| {
-                    let attr_name = [b"xmlns:".as_ref(), &prefix.value()].concat();
+                    let sep = if !prefix.value().is_empty() {
+                        b":".to_vec()
+                    } else {
+                        b"".to_vec()
+                    };
+                    let attr_name = [b"xmlns".as_ref(), &sep, &prefix.value()].concat();
                     let a = syn::LitByteStr::new(&attr_name, prefix.span());
                     quote! {
                          bytes_start.push_attribute((#a.as_ref(), #ns.as_ref()));
@@ -275,7 +280,13 @@ impl NamedStruct {
                     let prefix = ns
                         .map(|ns| namespaces.get(&ns))
                         .unwrap_or(None)
-                        .map(|prefix| [*prefix, b":"].concat());
+                        .map(|prefix| {
+                            if !prefix.is_empty() {
+                                [*prefix, b":"].concat()
+                            } else {
+                                Vec::new()
+                            }
+                        });
                     let has_prefix = prefix.is_some();
                     let tagname = tag.map(|tag| [&prefix.unwrap_or_default(), tag].concat());
                     let qname = tagname.as_ref().map(|tagname| ::quick_xml::name::QName(tagname));
diff --git a/crates/xml/src/lib.rs b/crates/xml/src/lib.rs
index 30484a2..c710d0f 100644
--- a/crates/xml/src/lib.rs
+++ b/crates/xml/src/lib.rs
@@ -47,7 +47,13 @@ impl XmlSerialize for () {
         let prefix = ns
             .map(|ns| namespaces.get(&ns))
             .unwrap_or(None)
-            .map(|prefix| [*prefix, b":"].concat());
+            .map(|prefix| {
+                if !prefix.is_empty() {
+                    [*prefix, b":"].concat()
+                } else {
+                    Vec::new()
+                }
+            });
         let has_prefix = prefix.is_some();
         let tagname = tag.map(|tag| [&prefix.unwrap_or_default(), tag].concat());
         let qname = tagname.as_ref().map(|tagname| QName(tagname));
diff --git a/crates/xml/src/value.rs b/crates/xml/src/value.rs
index 6f9f80a..6912de9 100644
--- a/crates/xml/src/value.rs
+++ b/crates/xml/src/value.rs
@@ -103,7 +103,13 @@ impl<T: Value> XmlSerialize for T {
         let prefix = ns
             .map(|ns| namespaces.get(&ns))
             .unwrap_or(None)
-            .map(|prefix| [*prefix, b":"].concat());
+            .map(|prefix| {
+                if !prefix.is_empty() {
+                    [*prefix, b":"].concat()
+                } else {
+                    Vec::new()
+                }
+            });
         let has_prefix = prefix.is_some();
         let tagname = tag.map(|tag| [&prefix.unwrap_or_default(), tag].concat());
         let qname = tagname.as_ref().map(|tagname| QName(tagname));