diff --git a/dap/accumulator.py b/dap/accumulator.py
index b30760d..fbc51f6 100644
--- a/dap/accumulator.py
+++ b/dap/accumulator.py
@@ -11,7 +11,7 @@ def main():
     parser = argparse.ArgumentParser()
 
     parser.add_argument("--accumulator_host", default="*")
-    parser.add_argument("--accumulator_port", type=int, default=13002)
+    parser.add_argument("--accumulator_port", type=int, default=13000)
 
     clargs = parser.parse_args()
 
diff --git a/dap/worker.py b/dap/worker.py
index 7567737..d94405d 100644
--- a/dap/worker.py
+++ b/dap/worker.py
@@ -16,9 +16,9 @@ def main():
     parser.add_argument("--backend_host", required=True)
     parser.add_argument("--backend_port", required=True)
     parser.add_argument("--accumulator_host", default="localhost")
-    parser.add_argument("--accumulator_port", type=int, default=13002)
+    parser.add_argument("--accumulator_port", type=int, default=13000)
     parser.add_argument("--visualisation_host", default="localhost")
-    parser.add_argument("--visualisation_port", type=int, default=13002)
+    parser.add_argument("--visualisation_port", type=int, default=12000)
     parser.add_argument("--peakfinder_parameters", default=None, help="json file with peakfinder parameters")
     parser.add_argument("--skip_frames_rate", type=int, default=1, help="skip (approximately) skip_frames_rate %% of pulses")