diff --git a/internal/runconfig/runconfig.go b/internal/runconfig/runconfig.go
index 45358d1..7233a86 100644
--- a/internal/runconfig/runconfig.go
+++ b/internal/runconfig/runconfig.go
@@ -59,6 +59,7 @@ func genRuntime(c *config.Config, ce *config.Runtime, variables map[string]strin
 
 	return &rstypes.Runtime{
 		Type:       rstypes.RuntimeType(ce.Type),
+		Arch:       ce.Arch,
 		Containers: containers,
 	}
 }
diff --git a/internal/services/runservice/types/types.go b/internal/services/runservice/types/types.go
index d9af754..5d6d1ff 100644
--- a/internal/services/runservice/types/types.go
+++ b/internal/services/runservice/types/types.go
@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/mitchellh/copystructure"
+	"github.com/sorintlab/agola/internal/common"
 	"github.com/sorintlab/agola/internal/util"
 )
 
@@ -366,6 +367,7 @@ type RegistryAuth struct {
 
 type Runtime struct {
 	Type       RuntimeType  `json:"type,omitempty"`
+	Arch       common.Arch  `json:"arch,omitempty"`
 	Containers []*Container `json:"containers,omitempty"`
 }