diff --git a/src/metric.py b/src/metric.py
index 45ec335..931d7ad 100644
--- a/src/metric.py
+++ b/src/metric.py
@@ -132,10 +132,9 @@ def compute_detect_correct_label_list(src_text, trg_text):
                     correct_ref_list.append((src_i, trg_token))
 
             elif tag == 'delete':
-                for count, src_i in enumerate(range(src_i1, src_i2)):
-                    trg_token = ''
-                    detect_ref_list.append(src_i)
-                    correct_ref_list.append((src_i, trg_token))
+                trg_token = 'D'*(src_i2-src_i1)
+                detect_ref_list.append(src_i1)
+                correct_ref_list.append((src_i1, trg_token))
 
             elif tag == 'insert':
                 trg_token = trg_text[trg_i1:trg_i2]
@@ -220,4 +219,4 @@ def final_f1_score(src_texts,
     json.dump(json_data, _log_fp, indent=4)
     logger.info('final f1:{}'.format(final_f1))
     logger.info('f1 logfile saved at:{}'.format(log_fp))
-    return final_f1
+    return final_f1
\ No newline at end of file