diff --git a/apps/wpm/services.py b/apps/wpm/services.py
index 1f016479..5f56828a 100644
--- a/apps/wpm/services.py
+++ b/apps/wpm/services.py
@@ -433,7 +433,7 @@ def cal_mlog_count_from_mlogb(mlog: Mlog):
             "total_count_ok": Sum('count_ok'),
             "total_count_notok": Sum('count_notok'),
         }
-        f_names = [f.name for f in Mlogb._meta.fields if 'count_n' in f.name]
+        f_names = [f.name for f in Mlogb._meta.fields if 'count_n_' in f.name]
         for f in f_names:
             a_dict[f'total_{f}'] = Sum(f)
         mlogb_summary = Mlogb.objects.filter(mlog=mlog).aggregate(