diff --git a/backend/internal/service/channel_monitor_checker_body_test.go b/backend/internal/service/channel_monitor_checker_body_test.go
index 3375ee6ac9..2357646337 100644
--- a/backend/internal/service/channel_monitor_checker_body_test.go
+++ b/backend/internal/service/channel_monitor_checker_body_test.go
@@ -199,7 +199,7 @@ func TestGrokMonitorConfiguration(t *testing.T) {
 	if err := validateProvider(MonitorProviderGrok); err != nil {
 		t.Fatalf("grok provider should be supported: %v", err)
 	}
-	if got := normalizeMonitorPrimaryModel(MonitorProviderGrok, ""); got != MonitorDefaultGrokModel {
+	if got := normalizeMonitorPrimaryModel(MonitorProviderGrok, MonitorCheckModeProbe, ""); got != MonitorDefaultGrokModel {
 		t.Fatalf("expected default Grok model %q, got %q", MonitorDefaultGrokModel, got)
 	}
 	if err := validateAPIMode(MonitorProviderGrok, MonitorAPIModeChatCompletions); err != nil {