diff --git a/cmd/buildkitd/main_windows.go b/cmd/buildkitd/main_windows.go
index 196e4c6f7526..309cac0c0e35 100644
--- a/cmd/buildkitd/main_windows.go
+++ b/cmd/buildkitd/main_windows.go
@@ -8,6 +8,7 @@ import (
 	"net"
 
 	_ "github.com/moby/buildkit/solver/llbsolver/ops"
+	_ "github.com/moby/buildkit/util/system/getuserinfo"
 	"github.com/pkg/errors"
 )
 
diff --git a/util/system/getuserinfo/userinfo_windows.go b/util/system/getuserinfo/userinfo_windows.go
new file mode 100644
index 000000000000..13da39fdc9f0
--- /dev/null
+++ b/util/system/getuserinfo/userinfo_windows.go
@@ -0,0 +1,44 @@
+package getuserinfo
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/docker/docker/pkg/idtools"
+	"github.com/docker/docker/pkg/reexec"
+)
+
+const (
+	getUserInfoCmd = "get-user-info"
+)
+
+func init() {
+	reexec.Register(getUserInfoCmd, userInfoMain)
+}
+
+func userInfoMain() {
+	if len(os.Args) != 2 {
+		fmt.Println("Usage: get-user-info usernameOrGroup")
+		os.Exit(1)
+	}
+	username := os.Args[1]
+	sid, _, _, err := windows.LookupSID("", username)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(3)
+	}
+
+	ident := idtools.Identity{
+		SID: sid.String(),
+	}
+
+	asJson, err := json.Marshal(ident)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(5)
+	}
+	fmt.Fprintf(os.Stdout, "%s", string(asJson))
+}