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 78b4cdd67d6..6a5dd8f779c 100644
--- a/src/azure-cli/azure/cli/command_modules/backup/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/backup/custom.py
@@ -71,6 +71,7 @@
     "eastasia": "southeastasia",
     "eastus": "westus",
     "eastus2": "centralus",
+    "eastus3": "westus3",
     "eastus2euap": "centraluseuap",
     "francecentral": "francesouth",
     "francesouth": "francecentral",