diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index b81ad195ce..f0913ea5e4 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -270,7 +270,7 @@ func setTimeField(val string, structField reflect.StructField, value reflect.Val
 
 	switch tf := strings.ToLower(timeFormat); tf {
 	case "unix", "unixnano":
-		tv, err := strconv.ParseInt(val, 10, 0)
+		tv, err := strconv.ParseInt(val, 10, 64)
 		if err != nil {
 			return err
 		}