diff --git a/modules/workbenches/modeler/features/mirrorBody/mirrorBody.operation.ts b/modules/workbenches/modeler/features/mirrorBody/mirrorBody.operation.ts
index e7eaad61..d1fe5dbe 100644
--- a/modules/workbenches/modeler/features/mirrorBody/mirrorBody.operation.ts
+++ b/modules/workbenches/modeler/features/mirrorBody/mirrorBody.operation.ts
@@ -27,8 +27,7 @@ export const MirrorBodyOperation: OperationDescriptor<MirrorBodyParams> = {
     params.inputBodies.forEach((shellToMirror) => {
       const newShellName = shellToMirror.id + ":mirror";
       oci.copy(shellToMirror, newShellName);
-      params.face.csys.origin.data();
-      oci.tmirror(newShellName, ...params.face.csys.origin.data(), ...params.face.csys.origin.normalize().data());
+      oci.tmirror(newShellName, ...params.face.csys.origin.data(), ...params.face.csys.z.normalize().data());
       created.push(occ.io.getShell(newShellName));
     });