diff --git a/src/main.rs b/src/main.rs
index 035b4ba..0a21937 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -425,8 +425,8 @@ where
 {
     use serde::Deserialize;
 
-    let opt = Option::<&'de str>::deserialize(de)?;
-    match opt {
+    let opt = Option::<std::borrow::Cow<'de, str>>::deserialize(de)?;
+    match opt.as_deref() {
         None | Some("") => Ok(None),
         Some(s) => s.parse::<T>().map_err(serde::de::Error::custom).map(Some),
     }
@@ -671,4 +671,48 @@ mod parse_query_params {
     )
     "#);
     }
+
+    #[test]
+    fn ipv4_and_empty_ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=1.2.3.4&ipv6=")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: Some(
+                1.2.3.4,
+            ),
+            ipv6: None,
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
+
+    #[test]
+    fn empty_ipv4_and_ipv6() {
+        let uri = http::Uri::builder()
+            .path_and_query("/update?ipv4=&ipv6=%3A%3A1234")
+            .build()
+            .unwrap();
+        let query: Query<FritzBoxUpdateParams> = Query::try_from_uri(&uri).unwrap();
+        insta::assert_debug_snapshot!(query, @r#"
+    Query(
+        FritzBoxUpdateParams {
+            domain: None,
+            ipv4: None,
+            ipv6: Some(
+                ::1234,
+            ),
+            ipv6prefix: None,
+            dualstack: None,
+        },
+    )
+    "#);
+    }
 }