diff --git a/src/server.rs b/src/server.rs
index 77deb8d..595721f 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -270,8 +270,11 @@ impl Server {
                     }
                 }
                 "MKCOL" => {
-                    if !allow_upload || !is_miss {
+                    if !allow_upload {
                         status_forbid(&mut res);
+                    } else if !is_miss {
+                        *res.status_mut() = StatusCode::METHOD_NOT_ALLOWED;
+                        *res.body_mut() = Body::from("Already exists");
                     } else {
                         self.handle_mkcol(path, &mut res).await?;
                     }
diff --git a/tests/webdav.rs b/tests/webdav.rs
index cedfad5..04b4ae0 100644
--- a/tests/webdav.rs
+++ b/tests/webdav.rs
@@ -93,6 +93,13 @@ fn mkcol_not_allow_upload(server: TestServer) -> Result<(), Error> {
     Ok(())
 }
 
+#[rstest]
+fn mkcol_already_exists(#[with(&["-A"])] server: TestServer) -> Result<(), Error> {
+    let resp = fetch!(b"MKCOL", format!("{}dira", server.url())).send()?;
+    assert_eq!(resp.status(), 405);
+    Ok(())
+}
+
 #[rstest]
 fn copy_file(#[with(&["-A"])] server: TestServer) -> Result<(), Error> {
     let new_url = format!("{}test2.html", server.url());