diff --git a/src/messages/extendedquery.rs b/src/messages/extendedquery.rs
index f50c377..a623216 100644
--- a/src/messages/extendedquery.rs
+++ b/src/messages/extendedquery.rs
@@ -23,7 +23,7 @@ impl Message for Parse {
     fn message_length(&self) -> usize {
         4 + codec::option_string_len(&self.name) // name
             + (1 + self.query.len()) // query
-            + (4 * self.type_oids.len()) // type oids
+            + 2 + (4 * self.type_oids.len()) // type oids
     }
 
     fn encode_body(&self, buf: &mut bytes::BytesMut) -> PgWireResult<()> {