diff --git a/ofm_config_full.json b/ofm_config_full.json
index 16a211fb..53ca2587 100644
--- a/ofm_config_full.json
+++ b/ofm_config_full.json
@@ -26,6 +26,7 @@
         "bg_channel_deviations_luv": "openflexure_microscope_server.things.background_detect:ChannelDeviationLUV"
     },
     "settings_folder": "/var/openflexure/settings/",
+    "api_prefix": "/api/v3",
     "application_config": {
         "log_folder": "/var/openflexure/logs/",
         "data_folder": "/var/openflexure/data/"
diff --git a/ofm_config_manual.json b/ofm_config_manual.json
index 4498cf81..e9b0c092 100644
--- a/ofm_config_manual.json
+++ b/ofm_config_manual.json
@@ -4,6 +4,7 @@
         "system": "openflexure_microscope_server.things.system:OpenFlexureSystem"
     },
     "settings_folder": "./openflexure/settings/",
+    "api_prefix": "/api/v3",
     "application_config": {
         "log_folder": "./openflexure/logs/",
         "data_folder": "./openflexure/data/"
diff --git a/ofm_config_simulation.json b/ofm_config_simulation.json
index b52ce4d7..076d7243 100644
--- a/ofm_config_simulation.json
+++ b/ofm_config_simulation.json
@@ -20,6 +20,7 @@
         "bg_channel_deviations_luv": "openflexure_microscope_server.things.background_detect:ChannelDeviationLUV"
     },
     "settings_folder": "./openflexure/settings/",
+    "api_prefix": "/api/v3",
     "application_config": {
         "log_folder": "./openflexure/logs/",
         "data_folder": "./openflexure/data/"
diff --git a/tests/lifecycle_test/testfile.py b/tests/lifecycle_test/testfile.py
index 2278c6e2..48b41f69 100755
--- a/tests/lifecycle_test/testfile.py
+++ b/tests/lifecycle_test/testfile.py
@@ -74,7 +74,7 @@ def main() -> None:
 def test_client_connection() -> None:
     """Check a ThingClient can interact with the simulation microscope camera."""
     print("Connecting Python client to microscope, and capturing image")
-    cam_client = lt.ThingClient.from_url("http://localhost:5000/camera/")
+    cam_client = lt.ThingClient.from_url("http://localhost:5000/api/v3/camera/")
     img = Image.open(cam_client.grab_jpeg().open())
     print(f"Successfully grabbed image of size {img.size}")
     assert img.size == (820, 616)
@@ -95,7 +95,7 @@ def subscribe_to_mjpeg_stream() -> subprocess.Popen:
         "nohup",
         "curl",
         "-s",
-        "http://localhost:5000/camera/mjpeg_stream",
+        "http://localhost:5000/api/v3/camera/mjpeg_stream",
         ">",
         "/dev/null",
         "2>&1",