diff --git a/python/ideep4py/py/swig_utils/pep_3118.i b/python/ideep4py/py/swig_utils/pep_3118.i
index 7a573469..2f673f1f 100755
--- a/python/ideep4py/py/swig_utils/pep_3118.i
+++ b/python/ideep4py/py/swig_utils/pep_3118.i
@@ -60,7 +60,7 @@
 }
 
 %typemap(in) (VIEW) (int res, Py_buffer view
-  , int flags = PyBUF_C_CONTIGUOUS | PyBUF_RECORDS) {
+  , int flags = PyBUF_C_CONTIGUOUS | PyBUF_RECORDS_RO) {
   /* view = new Py_buffer;*/
   res = PyObject_GetBuffer($input, &view, flags);
   if (res != 0) {