diff --git a/src/azure-cli/azure/cli/command_modules/vm/custom.py b/src/azure-cli/azure/cli/command_modules/vm/custom.py
index 181cd1a51d4..483004b14f7 100644
--- a/src/azure-cli/azure/cli/command_modules/vm/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/vm/custom.py
@@ -1003,6 +1003,8 @@ def auto_shutdown_vm(cmd, resource_group_name, vm_name, off=None, email=None, we
         raise CLIError('usage error: --time is a required parameter')
     daily_recurrence = {'time': time}
     notification_settings = None
+    if email and not webhook:
+        raise CLIError('usage error: --webhook is a required parameter when --email exists')
     if webhook:
         notification_settings = {
             'emailRecipient': email,