diff --git a/dap/algos/forcesend.py b/dap/algos/forcesend.py
index f1f205d..73d19c2 100644
--- a/dap/algos/forcesend.py
+++ b/dap/algos/forcesend.py
@@ -15,7 +15,7 @@ def calc_force_send(results, data, pixel_mask_pf, image, data_summed, n_aggregat
 
     if not apply_aggregation:
         data_summed = None
-        n_aggregated_images = 1
+        n_aggregated_images = 0
 
     if not apply_aggregation and not apply_threshold:
         data = image
@@ -73,7 +73,7 @@ def calc_apply_aggregation(results, data, data_summed, n_aggregated_images):
     if n_aggregated_images >= results["aggregation_max"]:
         force_send_visualisation = True
         data_summed = None
-        n_aggregated_images = 1
+        n_aggregated_images = 0
 
     return data, force_send_visualisation, data_summed, n_aggregated_images
 
diff --git a/dap/worker.py b/dap/worker.py
index 25655bd..3919c33 100644
--- a/dap/worker.py
+++ b/dap/worker.py
@@ -45,7 +45,7 @@ def work(backend_address, accumulator_host, accumulator_port, visualisation_host
 
 
     data_summed = None
-    n_aggregated_images = 1
+    n_aggregated_images = 0
 
 
     while True: