diff --git a/build/Dockerfile b/build/Dockerfile
index c1156ae74b..b2f45da8c8 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -69,4 +69,6 @@ COPY --from=build /repo/build/tgs.docker.sh tgs.sh
 
 VOLUME ["/config_data", "/tgs_logs", "/app/lib"]
 
+ENV General__ValidInstancePaths__0 /tgs4_instances
+
 ENTRYPOINT ["./tgs.sh"]