diff --git a/internal/installcfg/builder/builder.go b/internal/installcfg/builder/builder.go
index 2bbb180410bb..4539065e742e 100644
--- a/internal/installcfg/builder/builder.go
+++ b/internal/installcfg/builder/builder.go
@@ -112,6 +112,18 @@ func (i *installConfigBuilder) getBasicInstallConfig(cluster *common.Cluster) (*
 		SSHKey:     cluster.SSHPublicKey,
 	}
 
+	if cfg.ControlPlane.Replicas == 2 {
+		cfg.Arbiter = struct {
+			Hyperthreading string `json:"hyperthreading,omitempty"`
+			Name           string `json:"name"`
+			Replicas       int    `json:"replicas"`
+		}{
+			Hyperthreading: i.getHypethreadingConfiguration(cluster, "master"),
+			Name:           string(models.HostRoleArbiter),
+			Replicas:       1,
+		}
+	}
+
 	cfg.Networking.NetworkType = networkType
 
 	for _, network := range cluster.ClusterNetworks {
diff --git a/internal/installcfg/installcfg.go b/internal/installcfg/installcfg.go
index 36396f5a598d..8ba75ba084b0 100644
--- a/internal/installcfg/installcfg.go
+++ b/internal/installcfg/installcfg.go
@@ -233,6 +233,11 @@ type InstallerConfigBaremetal struct {
 		Name           string `json:"name"`
 		Replicas       int    `json:"replicas"`
 	} `json:"controlPlane"`
+	Arbiter struct {
+		Hyperthreading string `json:"hyperthreading,omitempty"`
+		Name           string `json:"name"`
+		Replicas       int    `json:"replicas"`
+	} `json:"arbiter"`
 	Platform              Platform            `json:"platform"`
 	BootstrapInPlace      *BootstrapInPlace   `json:"bootstrapInPlace,omitempty"`
 	FIPS                  bool                `json:"fips"`
diff --git a/models/host_role.go b/models/host_role.go
index fad00d87b089..8dd82807e6f2 100644
--- a/models/host_role.go
+++ b/models/host_role.go
@@ -41,6 +41,9 @@ const (
 
 	// HostRoleBootstrap captures enum value "bootstrap"
 	HostRoleBootstrap HostRole = "bootstrap"
+
+	// HostRoleArbiter captures enum value "arbiter"
+	HostRoleArbiter HostRole = "arbiter"
 )
 
 // for schema
@@ -48,7 +51,7 @@ var hostRoleEnum []interface{}
 
 func init() {
 	var res []HostRole
-	if err := json.Unmarshal([]byte(`["auto-assign","master","worker","bootstrap"]`), &res); err != nil {
+	if err := json.Unmarshal([]byte(`["auto-assign","master","worker","bootstrap","arbiter"]`), &res); err != nil {
 		panic(err)
 	}
 	for _, v := range res {
diff --git a/swagger.yaml b/swagger.yaml
index a15774c19f56..19e24e7f5406 100644
--- a/swagger.yaml
+++ b/swagger.yaml
@@ -6609,6 +6609,7 @@ definitions:
       - 'master'
       - 'worker'
       - 'bootstrap'
+      - 'arbiter'
 
   host-validation-id:
     type: string
diff --git a/vendor/github.com/openshift/assisted-service/models/host_role.go b/vendor/github.com/openshift/assisted-service/models/host_role.go
index fad00d87b089..8dd82807e6f2 100644
--- a/vendor/github.com/openshift/assisted-service/models/host_role.go
+++ b/vendor/github.com/openshift/assisted-service/models/host_role.go
@@ -41,6 +41,9 @@ const (
 
 	// HostRoleBootstrap captures enum value "bootstrap"
 	HostRoleBootstrap HostRole = "bootstrap"
+
+	// HostRoleArbiter captures enum value "arbiter"
+	HostRoleArbiter HostRole = "arbiter"
 )
 
 // for schema
@@ -48,7 +51,7 @@ var hostRoleEnum []interface{}
 
 func init() {
 	var res []HostRole
-	if err := json.Unmarshal([]byte(`["auto-assign","master","worker","bootstrap"]`), &res); err != nil {
+	if err := json.Unmarshal([]byte(`["auto-assign","master","worker","bootstrap","arbiter"]`), &res); err != nil {
 		panic(err)
 	}
 	for _, v := range res {