diff --git a/bin/vault-sshadd b/bin/vault-sshadd
index f4f8da4..daeee3a 100755
--- a/bin/vault-sshadd
+++ b/bin/vault-sshadd
@@ -65,7 +65,7 @@ EOF
 
   if [ $? -eq 0 ]; then
     info "[${KEY_NAME}] Should be loaded by now."
-    vault-patch --log-level=warn secret/ssh-key/${KEY_NAME} last_used=$(date -Iseconds)
+    vault-patch --log-level=warn secret/ssh-key/${KEY_NAME} last_used=$(date +%Y-%m-%dT%H:%M:%S%z)
   else
     error "[${KEY_NAME}] Was not added successfully."
   fi