diff --git a/NHSE.WinForms/Controls/AchievementRow.cs b/NHSE.WinForms/Controls/AchievementRow.cs
index 64135ae..e012bb7 100644
--- a/NHSE.WinForms/Controls/AchievementRow.cs
+++ b/NHSE.WinForms/Controls/AchievementRow.cs
@@ -52,7 +52,13 @@ public void ChangeCount(in int index, in int row, in uint count)
                 return;
 
             var threshold = detail.GetThresholdValue(row);
-            L_Threshold.ForeColor = row < detail.AchievementCount && count >= threshold ? Color.Red : CHK_Read.ForeColor;
+            if (threshold == 0)
+            {
+                var bit = (count >> row) & 1;
+                L_Threshold.ForeColor = bit != 0 ? Color.Red : CHK_Read.ForeColor;
+                return;
+            }
+            L_Threshold.ForeColor = count >= threshold ? Color.Red : CHK_Read.ForeColor;
         }
 
         private void CAL_Date_MouseDown(object sender, MouseEventArgs e)