diff --git a/ast/Node.go b/ast/Node.go
index 1a09053..62f1867 100644
--- a/ast/Node.go
+++ b/ast/Node.go
@@ -25,5 +25,7 @@ func DoChildNodes(childNodes []Node, env map[string]interface{}) ([]byte, error)
 			sql.Write(r)
 		}
 	}
-	return sql.Bytes(), nil
+	var bytes = sql.Bytes()
+	sql.Reset()
+	return bytes, nil
 }
diff --git a/ast/NodeForEach.go b/ast/NodeForEach.go
index 9286018..27ae875 100644
--- a/ast/NodeForEach.go
+++ b/ast/NodeForEach.go
@@ -92,10 +92,12 @@ func (it *NodeForEach) Eval(env map[string]interface{}) ([]byte, error) {
 	}
 	var newTempSql bytes.Buffer
 	var tempSqlString = bytes.Trim(tempSql.Bytes(), it.separator)
+	tempSql.Reset()
 	newTempSql.WriteString(it.open)
 	newTempSql.Write(tempSqlString)
 	newTempSql.WriteString(it.close)
-	tempSql.Reset()
-	return newTempSql.Bytes(), nil
+	var newTempSqlBytes=newTempSql.Bytes()
+	newTempSql.Reset()
+	return newTempSqlBytes, nil
 }
 
diff --git a/ast/NodeTrim.go b/ast/NodeTrim.go
index 2de23ef..eaf0533 100644
--- a/ast/NodeTrim.go
+++ b/ast/NodeTrim.go
@@ -49,5 +49,8 @@ func (it *NodeTrim) Eval(env map[string]interface{}) ([]byte, error) {
 	newBuffer.Write(sql)
 	newBuffer.WriteString(` `)
 	newBuffer.Write(it.suffix)
-	return newBuffer.Bytes(), nil
+
+	var newBufferBytes=newBuffer.Bytes()
+	newBuffer.Reset()
+	return newBufferBytes, nil
 }