diff --git a/pkg/service/cluster.go b/pkg/service/cluster.go
index 8e677e9..38fca25 100644
--- a/pkg/service/cluster.go
+++ b/pkg/service/cluster.go
@@ -253,14 +253,23 @@ func clusterActiveRemotePodLoads(namespace, run string) map[string]int {
 }
 
 func (a *App) podImageForArch(arch string) string {
+	var image string
 	switch strings.TrimSpace(arch) {
 	case "arm64":
-		return strings.TrimSpace(a.settings.RunnerImageARM64)
+		image = strings.TrimSpace(a.settings.RunnerImageARM64)
 	case "amd64":
-		return strings.TrimSpace(a.settings.RunnerImageAMD64)
+		image = strings.TrimSpace(a.settings.RunnerImageAMD64)
 	default:
 		return ""
 	}
+	if image == "" || strings.Contains(image, "/") {
+		return image
+	}
+	registry := strings.Trim(strings.TrimSpace(a.settings.HarborRegistry), "/")
+	if registry == "" {
+		registry = "registry.bstein.dev"
+	}
+	return registry + "/bstein/metis:" + strings.TrimLeft(image, ":")
 }
 
 func (a *App) runRemotePod(jobID, podName string, podSpec map[string]any) (string, error) {
diff --git a/pkg/service/coverage_more_test.go b/pkg/service/coverage_more_test.go
index c0fc9e3..1b757b2 100644
--- a/pkg/service/coverage_more_test.go
+++ b/pkg/service/coverage_more_test.go
@@ -443,7 +443,9 @@ func TestServiceClusterAndRemotePodBranches(t *testing.T) {
 
 	app := newTestApp(t)
 	app.settings.Namespace = "maintenance"
-	app.settings.RunnerImageARM64 = "runner:arm64"
+	app.settings.HarborRegistry = "registry.example"
+	app.settings.RunnerImageARM64 = "0.1.0-97-arm64"
+	app.settings.RunnerImageAMD64 = "registry.example/custom/metis:0.1.0-97-amd64"
 	state, err := app.remotePodState(client, "metis-build-test")
 	if err != nil {
 		t.Fatalf("remotePodState: %v", err)
@@ -455,10 +457,10 @@ func TestServiceClusterAndRemotePodBranches(t *testing.T) {
 	if err != nil || logs != "pod logs" {
 		t.Fatalf("remotePodLogs = %q err=%v", logs, err)
 	}
-	if got := app.podImageForArch("amd64"); got != "" {
-		t.Fatalf("podImageForArch fallback = %q", got)
+	if got := app.podImageForArch("amd64"); got != "registry.example/custom/metis:0.1.0-97-amd64" {
+		t.Fatalf("podImageForArch amd64 = %q", got)
 	}
-	if got := app.podImageForArch("arm64"); got != "runner:arm64" {
+	if got := app.podImageForArch("arm64"); got != "registry.example/bstein/metis:0.1.0-97-arm64" {
 		t.Fatalf("podImageForArch arm64 = %q", got)
 	}