diff --git a/e2e/docker-compose.test.yml b/e2e/docker-compose.test.yml
index d6b53d9..05eae73 100644
--- a/e2e/docker-compose.test.yml
+++ b/e2e/docker-compose.test.yml
@@ -2,9 +2,9 @@ name: detections-e2e
 
 services:
   mock-loader:
-    build: ./mocks/loader
-    volumes:
-      - ./fixtures:/models
+    build:
+      context: .
+      dockerfile: mocks/loader/Dockerfile
     networks:
       - e2e-net
 
@@ -93,6 +93,7 @@ services:
       - mock-annotations
     environment:
       JWT_SECRET: test-secret-e2e-only
+      MEDIA_DIR: /app/fixtures
     volumes:
       - ./fixtures:/media
       - ./results:/results
diff --git a/e2e/mocks/loader/Dockerfile b/e2e/mocks/loader/Dockerfile
index 1e4aea5..b60e0e6 100644
--- a/e2e/mocks/loader/Dockerfile
+++ b/e2e/mocks/loader/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3.11-slim
 WORKDIR /app
 RUN pip install --no-cache-dir flask gunicorn
-COPY app.py .
+COPY mocks/loader/app.py .
+COPY fixtures /models
 EXPOSE 8080
 CMD ["gunicorn", "-b", "0.0.0.0:8080", "-w", "1", "--timeout", "120", "app:app"]