diff --git a/.dockerignore b/.dockerignore
index ba6615e..3eb8fac 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -6,4 +6,5 @@
 Dockerfile
 bin/run-in-docker.sh
 bin/run-tests-in-docker.sh
+bin/run-tests.sh
 tests/
diff --git a/bin/run-tests-in-docker.sh b/bin/run-tests-in-docker.sh
index 7c45972..ee2fa29 100755
--- a/bin/run-tests-in-docker.sh
+++ b/bin/run-tests-in-docker.sh
@@ -22,6 +22,7 @@ docker run \
     --read-only \
     --mount type=bind,src="${PWD}/tests",dst=/opt/test-runner/tests \
     --mount type=tmpfs,dst=/tmp \
+    --volume "${PWD}/bin/run-tests.sh:/opt/test-runner/bin/run-tests.sh" \
     --workdir /opt/test-runner \
     --entrypoint /opt/test-runner/bin/run-tests.sh \
     exercism/test-runner