diff --git a/examples/cylinder/waveguide.json b/examples/cylinder/waveguide.json
index e24de9ab6..c69dcc47a 100644
--- a/examples/cylinder/waveguide.json
+++ b/examples/cylinder/waveguide.json
@@ -39,7 +39,7 @@
       {
         "DonorAttributes": [2],
         "ReceiverAttributes": [3],
-        "Translation": [0.0, 0.0, 5.48] // in L0 units
+        "Translation": [0.0, 0.0, -5.48] // in L0 units
       }
     ],
     "PEC":