diff --git a/src/azure-cli/azure/cli/command_modules/mysql/custom.py b/src/azure-cli/azure/cli/command_modules/mysql/custom.py
index 4b00fa295fd..20e1338fac7 100644
--- a/src/azure-cli/azure/cli/command_modules/mysql/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/mysql/custom.py
@@ -321,7 +321,7 @@ def flexible_server_version_upgrade(cmd, client, resource_group_name, server_nam
                            "First upgrade {} server version to {} and try again.".format(replica.name, version_mapped))
 
     parameters = {
-        'version': version_mapped
+        'properties': {'version': version_mapped}
     }
 
     return resolve_poller(