diff --git a/modules/dcache-webdav/src/main/java/org/dcache/webdav/transfer/CopyFilter.java b/modules/dcache-webdav/src/main/java/org/dcache/webdav/transfer/CopyFilter.java
index 9a2dfb1d177..a9f1f3e944e 100644
--- a/modules/dcache-webdav/src/main/java/org/dcache/webdav/transfer/CopyFilter.java
+++ b/modules/dcache-webdav/src/main/java/org/dcache/webdav/transfer/CopyFilter.java
@@ -387,8 +387,9 @@ private void processThirdPartyCopy(Request request, Response response)
 
         TransferType type = TransferType.fromScheme(remote.getScheme());
 
+        var requestPath = URI.create(request.getAbsoluteUrl()).getPath();
         FsPath path = _pathMapper.asDcachePath(ServletRequest.getRequest(),
-              request.getAbsolutePath(), m -> new ErrorResponseException(Status.SC_FORBIDDEN, m));
+              requestPath, m -> new ErrorResponseException(Status.SC_FORBIDDEN, m));
 
         // Always check any client-supplied Overwrite header, to throw an error if the value is malformed.
         boolean overwriteAllowed = clientAllowsOverwrite();