diff --git a/sqlserver.go b/sqlserver.go
index 35c2b44..79ac1a4 100644
--- a/sqlserver.go
+++ b/sqlserver.go
@@ -157,8 +157,10 @@ func (dialector Dialector) DataTypeOf(field *schema.Field) string {
 		var sqlType string
 		switch {
 		case field.Size < 16:
-			sqlType = "smallint"
+			sqlType = "tinyint"
 		case field.Size < 31:
+			sqlType = "smallint"
+		case field.Size < 64:
 			sqlType = "int"
 		default:
 			sqlType = "bigint"