diff --git a/.buildkite/longruns/pipeline.yml b/.buildkite/longruns/pipeline.yml
index b2d0db5cd..c83a34c3b 100644
--- a/.buildkite/longruns/pipeline.yml
+++ b/.buildkite/longruns/pipeline.yml
@@ -26,3 +26,13 @@ steps:
     key: "cpu_unittests"
     command:
       - "julia --project=test --color=yes test/aerosol_activation_emulators.jl"
+ 
+  - wait
+
+  - label: ":envelope: Slack report"
+    command: |
+      if [ $$(buildkite-agent step get "outcome" --step "cpu_unittests") == "passed" ]; then
+        slack-message -c "#microphysics-dev" -x "CloudMicrophysics buildkite-longruns success"
+      else
+        slack-message -c "#microphysics-dev" -x "CloudMicrophysics buildkite-longruns failure"
+      fi
\ No newline at end of file