diff --git a/services/comms/synapse-signingkey-ensure-job.yaml b/services/comms/synapse-signingkey-ensure-job.yaml
index 4a2b89f..00b7080 100644
--- a/services/comms/synapse-signingkey-ensure-job.yaml
+++ b/services/comms/synapse-signingkey-ensure-job.yaml
@@ -2,7 +2,7 @@
 apiVersion: batch/v1
 kind: Job
 metadata:
-  name: othrys-synapse-signingkey-ensure-1
+  name: othrys-synapse-signingkey-ensure-2
   namespace: comms
 spec:
   backoffLimit: 2
@@ -21,7 +21,11 @@ spec:
             - |
               set -euo pipefail
               umask 077
-              generate_signing_key -o /work/signing.key
+              if which generate_signing_key.py >/dev/null; then
+                generate_signing_key.py -o /work/signing.key
+              else
+                generate_signing_key -o /work/signing.key
+              fi
           volumeMounts:
             - name: work
               mountPath: /work