diff --git a/statement.go b/statement.go
index b36a2ebf..4bde5c7b 100644
--- a/statement.go
+++ b/statement.go
@@ -61,6 +61,7 @@ func (statement *Statement) Init() {
 	statement.columnMap = make(map[string]bool)
 	statement.ConditionStr = ""
 	statement.AltTableName = ""
+	statement.IdParam = nil
 	statement.RawSQL = ""
 	statement.RawParams = make([]interface{}, 0)
 	statement.BeanArgs = make([]interface{}, 0)