diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index d28eaf4798774..a77fbdab36033 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -55,5 +55,5 @@ jobs:
         with:
           channel-id: 'build-failures-sui'
           slack-message: |
-            Workflow *${{ github.workflow }}* has failed.
+            :sui::error-cross: Workflow *${{ github.workflow }}* has failed.
             Logs are here: <${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|${{ github.run_id }}>
diff --git a/.github/workflows/simulator-nightly.yml b/.github/workflows/simulator-nightly.yml
index 0aa84f00334fd..6bfaebf46525d 100644
--- a/.github/workflows/simulator-nightly.yml
+++ b/.github/workflows/simulator-nightly.yml
@@ -145,7 +145,7 @@ jobs:
       with:
         channel-id: 'simtest-nightly'
         slack-message: |
-          *${{ github.workflow }}* workflow status: `${{ env.WORKFLOW_CONCLUSION }}`
+          :sui::error-cross: *${{ github.workflow }}* workflow status: `${{ env.WORKFLOW_CONCLUSION }}`
           Sui commit: <https://github.com/MystenLabs/sui/commit/${{ env.SUI_SHA }}|${{ env.SUI_SHA }}>
           Run: <${{ env.GH_JOB_LINK }}|${{ github.run_id }}>
           <@${{ env.SLACK_ID }}>, current `${{ env.ONCALL_NAME }}` oncall, please debug failures: `tsh ssh ubuntu@simtest-01` and look in the `/home/ubuntu/simtest_logs/{date}` folder for test results