diff --git a/source/smbd/trans2.c b/source/smbd/trans2.c
index 31fd18d..25b0c13 100644
--- a/source/smbd/trans2.c
+++ b/source/smbd/trans2.c
@@ -6362,6 +6362,8 @@ static NTSTATUS smb_posix_open(connection_struct *conn,
 		create_disp = FILE_OVERWRITE_IF;
 	} else if((wire_open_mode & SMB_O_CREAT) == SMB_O_CREAT) {
 		create_disp = FILE_OPEN_IF;
+	} else if ((wire_open_mode & (SMB_O_CREAT | SMB_O_EXCL | SMB_O_TRUNC)) == 0) {
+		create_disp = FILE_OPEN;
 	} else {
 		DEBUG(5,("smb_posix_open: invalid create mode 0x%x\n",
 			(unsigned int)wire_open_mode ));