diff --git a/src/anemoi/inference/outputs/gribfile.py b/src/anemoi/inference/outputs/gribfile.py
index ff99421..d6d9bf9 100644
--- a/src/anemoi/inference/outputs/gribfile.py
+++ b/src/anemoi/inference/outputs/gribfile.py
@@ -149,3 +149,4 @@ def _patch(r):
                 requests.append(request)
 
             json.dump(requests, f, indent=indent)
+            f.write("\n")