diff --git a/multigrid/quad.json b/multigrid/quad.json
index 408a9a8..da8c17c 100644
--- a/multigrid/quad.json
+++ b/multigrid/quad.json
@@ -39,7 +39,7 @@
     ],
     "integration_time": 2.0,
     "vortex": {
-        "x0": 0.0,
+        "x0": -1.0,
         "y0": 0.0,
         "mach": 0.5,
         "rstar": 0.5,