diff --git a/.buildkite/longtests.pipeline.yml b/.buildkite/longtests.pipeline.yml
new file mode 100644
index 00000000000..2d29055c702
--- /dev/null
+++ b/.buildkite/longtests.pipeline.yml
@@ -0,0 +1,48 @@
+# Copied from pipeline.yml.
+docker_plugin_default_config: &docker_plugin_default_config
+  image: "oasislabs/testing:0.3.0"
+  always_pull: true
+  workdir: /workdir
+  volumes:
+    - /var/lib/buildkite-agent/.coveralls:/root/.coveralls
+    - /var/lib/buildkite-agent/.codecov:/root/.codecov
+    # Shared Rust incremental compile caches.
+    - /tmp/cargo_ic/debug:/tmp/artifacts/debug/incremental
+    - /tmp/cargo_ic/debug_sgx:/tmp/artifacts/x86_64-unknown-linux-sgx/debug/incremental
+    # Shared Rust package checkouts directory.
+    - /tmp/cargo_pkg/git:/root/.cargo/git
+    - /tmp/cargo_pkg/registry:/root/.cargo/registry
+    # Shared Rust SGX standard library artifacts cache.
+    - /tmp/xargo_cache:/root/.xargo
+    # Shared Go package checkouts directory.
+    - /tmp/go_pkg:/root/go/pkg
+    # Intel SGX Application Enclave Services Manager (AESM) daemon running on
+    # the Buildkite host.
+    - /var/run/aesmd/aesm.socket:/var/run/aesmd/aesm.socket
+  # NOTE: When changing the environment variables below, also copy the changes
+  # to the docker_plugin_sgx_config.
+  environment:
+    - "LC_ALL=C.UTF-8"
+    - "LANG=C.UTF-8"
+    - "CARGO_TARGET_DIR=/tmp/artifacts"
+    - "CARGO_INSTALL_ROOT=/root/.cargo"
+    - "GOPROXY=https://proxy.golang.org/"
+  propagate-environment: true
+  unconfined: true
+
+docker_plugin: &docker_plugin
+  oasislabs/docker#v3.0.1-oasis1:
+    <<: *docker_plugin_default_config
+
+steps:
+  - label: Transaction source test
+    timeout_in_minutes: 480
+    command:
+      - make
+      - ./scripts/run-e2e-txsource.sh
+    env:
+      TEST_BASE_DIR: e2e
+    agents:
+      buildkite_agent_size: large
+    plugins:
+      <<: *docker_plugin
diff --git a/scripts/run-e2e-txsource.sh b/scripts/run-e2e-txsource.sh
index 3f75b15c138..8eacc72d7d7 100755
--- a/scripts/run-e2e-txsource.sh
+++ b/scripts/run-e2e-txsource.sh
@@ -1,5 +1,4 @@
 #!/bin/sh
-# (no merge)
 ./go/oasis-test-runner/oasis-test-runner \
     --basedir.no_cleanup \
     --e2e.node.binary go/oasis-node/oasis-node \