diff --git a/charts/argo-services/templates/workflows/post-sync/workflow.yaml b/charts/argo-services/templates/workflows/post-sync/workflow.yaml
index 8b8392a1711..c46fb132f87 100644
--- a/charts/argo-services/templates/workflows/post-sync/workflow.yaml
+++ b/charts/argo-services/templates/workflows/post-sync/workflow.yaml
@@ -126,11 +126,17 @@ spec:
         image: 172025368201.dkr.ecr.eu-west-1.amazonaws.com/github/alphagov/govuk/toolbox:latest
         command:
           - /bin/bash
+        volumeMounts:
+          - name: tmp
+            mountPath: /tmo
         resources: {}
         source: >
           #!/usr/bin/env bash
 
           echo {{"{{workflow.failures}}"}} | jq -r 'group_by(.templateName) | map({templateName: .[0].templateName, errorMessages: [.[].message | select(length > 0)] | unique}) | map("- \(.templateName): " + (["\(.errorMessages[])"] | join(",")) ) | .[]' > /tmp/message.txt
+      volumes:
+        - name: tmp
+          emptyDir: {}
     - name: exit-handler
       steps:
         - - name: parse-failures