diff --git a/ci/buildkite-pipeline.sh b/ci/buildkite-pipeline.sh
index 80660ad93e0130..b1d4d760c205cc 100755
--- a/ci/buildkite-pipeline.sh
+++ b/ci/buildkite-pipeline.sh
@@ -186,7 +186,7 @@ all_test_steps() {
              ^ci/rust-version.sh \
              ^ci/test-docs.sh \
       ; then
-    docker_command_step doctest "ci/test-docs.sh" 15
+    docker_command_step doctest "ci/test-docs.sh" $rust_nightly_docker_image 15
   else
     annotate --style info --context test-docs \
       "Docs skipped as no .rs files were modified"