diff --git a/.buildkite/pipeline.yml b/.buildkite/pipeline.yml
index 06880303ee63..02910d387e01 100644
--- a/.buildkite/pipeline.yml
+++ b/.buildkite/pipeline.yml
@@ -240,7 +240,7 @@ steps:
       queue: "release"
     branches: "shhs shhs-*"
     command:
-      - "docker build -f docker/Dockerfile-optimised --build-arg PYTHON_VERSION=3.6 --build-arg MARCH=skylake-avx512 . -t matrixdotorg/synapse:${BUILDKITE_TAG}-skylake-avx512"
-      - "docker docker save matrixdotorg/synapse:${BUILDKITE_TAG}-skylake-avx512 | gzip -9 > docker.tar.gz"
+      - "docker build -f docker/Dockerfile-optimised --build-arg PYTHON_VERSION=3.6 --build-arg MARCH=skylake-avx512 . -t matrixdotorg/synapse:${BUILDKITE_TAG}${BUILDKITE_BRANCH}-skylake-avx512"
+      - "docker docker save matrixdotorg/synapse:${BUILDKITE_TAG}${BUILDKITE_BRANCH}-skylake-avx512 | gzip -9 > docker.tar.gz"
     artifact_paths:
       - "docker.tar.gz"
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