diff --git a/infrastructure/abri/abri_client.py b/infrastructure/abri/abri_client.py
index 3f9cc19b0..4cfe51d7e 100644
--- a/infrastructure/abri/abri_client.py
+++ b/infrastructure/abri/abri_client.py
@@ -49,15 +49,18 @@ class AbriClient:
         return self._parse_job_logged(outcome)
 
     def amend_job(self, request: AmendJobRequest) -> AmendJobResult:
+        parameters = [
+            ("job_no", request.job_no),
+            ("action", "amend"),
+            ("appointment_date", request.appointment_date.strftime("%d/%m/%Y")),
+            ("appointment_time", request.appointment_time),
+        ]
+        if request.resource is not None:
+            parameters.append(("resource", request.resource))
+
         outcome = self._exchange(
             request_type="amendoptiappt",
-            parameters=[
-                ("job_no", request.job_no),
-                ("action", "amend"),
-                ("appointment_date", request.appointment_date.strftime("%d/%m/%Y")),
-                ("appointment_time", request.appointment_time),
-                ("resource", request.resource or ""),
-            ],
+            parameters=parameters,
         )
 
         if isinstance(outcome, AbriRequestRejected):