diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index dacd6fe0f60c..ba03b7d84fc2 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5232,6 +5232,7 @@ static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
 		cmd = hist_data->field_var_hists[i]->cmd;
 		ret = event_hist_trigger_func(&trigger_hist_cmd, file,
 					      "!hist", "hist", cmd);
+		WARN_ON_ONCE(ret < 0);
 	}
 }