diff --git a/orm/db.go b/orm/db.go
index 20d9c4cd..2148daaa 100644
--- a/orm/db.go
+++ b/orm/db.go
@@ -621,20 +621,31 @@ func (d *dbBase) Update(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.
 		return 0, err
 	}
 
-	var find bool
+	var findAutoNowAdd, findAutoNow bool
 	var index int
 	for i, col := range setNames {
 		if mi.fields.GetByColumn(col).autoNowAdd {
 			index = i
-			find = true
+			findAutoNowAdd = true
+		}
+		if mi.fields.GetByColumn(col).autoNow {
+			findAutoNow = true
 		}
 	}
-
-	if find {
+	if findAutoNowAdd {
 		setNames = append(setNames[0:index], setNames[index+1:]...)
 		setValues = append(setValues[0:index], setValues[index+1:]...)
 	}
 
+	if !findAutoNow {
+		for col, info := range mi.fields.columns {
+			if info.autoNow {
+				setNames = append(setNames, col)
+				setValues = append(setValues, time.Now())
+			}
+		}
+	}
+
 	setValues = append(setValues, pkValue)
 
 	Q := d.ins.TableQuote()