diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 214c129..85b0c78 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -78,10 +78,11 @@ jobs:
           composer install --no-dev
 
       # Start services with the appropriate profile
+      # OIDC modes need the override file to mount third_party into Nextcloud
       - name: Run docker compose
         uses: hoverkraft-tech/compose-action@4894d2492015c1774ee5a13a95b1072093087ec3 # v2.5.0
         with:
-          compose-file: "./docker-compose.yml"
+          compose-file: ${{ matrix.needs-oidc && './docker-compose.yml\n./docker-compose.oidc.yml' || './docker-compose.yml' }}
           compose-flags: "--profile ${{ matrix.profile }}"
           up-flags: "--build"
 
diff --git a/docker-compose.oidc.yml b/docker-compose.oidc.yml
new file mode 100644
index 0000000..65482e1
--- /dev/null
+++ b/docker-compose.oidc.yml
@@ -0,0 +1,7 @@
+# Override to mount the OIDC app into Nextcloud.
+# Use with: docker compose -f docker-compose.yml -f docker-compose.oidc.yml --profile <profile> up
+# Required for OAuth, Keycloak, and Login Flow profiles.
+services:
+  app:
+    volumes:
+      - ./third_party:/opt/apps:ro
diff --git a/docker-compose.yml b/docker-compose.yml
index 455ecc1..3edabe6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -35,7 +35,7 @@ services:
       - ./app-hooks:/docker-entrypoint-hooks.d:ro
       # Mount OIDC development directory outside /var/www/html to avoid rsync conflicts
       # The post-installation hook will register /opt/apps as an additional app directory
-      - ./third_party:/opt/apps:ro
+      #- ./third_party:/opt/apps:ro
     environment:
       - NEXTCLOUD_TRUSTED_DOMAINS=app
       - NEXTCLOUD_ADMIN_USER=admin