diff --git a/tests/system_tests/compose.yaml b/tests/system_tests/compose.yaml
index c5be60e48..61d91c8c5 100644
--- a/tests/system_tests/compose.yaml
+++ b/tests/system_tests/compose.yaml
@@ -6,7 +6,7 @@ services:
     image: ghcr.io/diamondlightsource/numtracker:1.0.2
     network_mode: host # Port 8406
     environment:
-      - NUMTRACKER_AUTH_HOST=http://localhost:8181/
+      - NUMTRACKER_AUTH_HOST=http://localhost:8181
       - NUMTRACKER_PORT=8406
       - NUMTRACKER_LOG_LEVEL=info
       - NUMTRACKER_AUTH_ACCESS=v1/data/diamond/policy/numtracker/write_to_beamline_visit