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diff --git a/third_party/bazel/rules_haskell/tests/run-start-script.sh b/third_party/bazel/rules_haskell/tests/run-start-script.sh
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+++ b/third_party/bazel/rules_haskell/tests/run-start-script.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# Run the start script in its own workspace
+# and build the example binary target.
+
+set -e
+
+pwd=$(pwd)
+cd $(mktemp -d)
+$pwd/start
+
+# Copy the bazel configuration, this is only useful for CI
+mkdir tools
+cp $pwd/.bazelrc .bazelrc
+
+# Set Nixpkgs in environment variable to avoid hardcoding it in
+# start script itself.
+
+# overrides the used rules_haskell, because
+# when we're testing the start on a feature branch (CI),
+# the latest rules_haskell version doesn't always work.
+# If on the branch we update Bazel to a version with breaking
+# changes, then we need to adapt to those changes in the branch.
+# Which in turn means the start script should pull in those changes too.
+
+NIX_PATH=nixpkgs=$pwd/nixpkgs/default.nix \
+  bazel build \
+  --config=ci \
+  --override_repository=io_tweag_rules_haskell=$pwd \
+  //:example