diff --git a/pkg/api/agentPoolOnlyApi/v20170831/types.go b/pkg/api/agentPoolOnlyApi/v20170831/types.go
index a9edeb2bab..fad1aa6ac5 100644
--- a/pkg/api/agentPoolOnlyApi/v20170831/types.go
+++ b/pkg/api/agentPoolOnlyApi/v20170831/types.go
@@ -103,6 +103,8 @@ const (
 	// Migrating means resource is being migrated from one subscription or
 	// resource group to another
 	Migrating ProvisioningState = "Migrating"
+	// Upgrading means an existing resource is being upgraded
+	Upgrading ProvisioningState = "Upgrading"
 )
 
 // PoolUpgradeProfile contains pool properties:
diff --git a/pkg/api/agentPoolOnlyApi/vlabs/types.go b/pkg/api/agentPoolOnlyApi/vlabs/types.go
index efec84c5cc..ded6078062 100644
--- a/pkg/api/agentPoolOnlyApi/vlabs/types.go
+++ b/pkg/api/agentPoolOnlyApi/vlabs/types.go
@@ -114,6 +114,8 @@ const (
 	// Migrating means resource is being migrated from one subscription or
 	// resource group to another
 	Migrating ProvisioningState = "Migrating"
+	// Upgrading means an existing resource is being upgraded
+	Upgrading ProvisioningState = "Upgrading"
 )
 
 // AgentPoolProfile represents configuration of VMs running agent