diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8af97fd4ee2d..b3df8862855f 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -3090,7 +3090,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
 		key_field = hist_data->fields[i];
 		if (!first)
 			seq_buf_putc(&s, ',');
-		seq_buf_puts(&s, key_field->field->name);
+		expr_field_str(key_field, &s);
 		first = false;
 	}