diff --git a/src/azure-cli/azure/cli/command_modules/backup/custom.py b/src/azure-cli/azure/cli/command_modules/backup/custom.py
index ffbbf7f2e11..c6dacc4da88 100644
--- a/src/azure-cli/azure/cli/command_modules/backup/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/backup/custom.py
@@ -92,6 +92,7 @@
     "southafricawest": "southafricanorth",
     "southcentralus": "northcentralus",
     "southeastasia": "eastasia",
+    "southeastus": "westus3",
     "southindia": "centralindia",
     "swedencentral": "swedensouth",
     "swedensouth": "swedencentral",