From 4d339681999b85c9f63690d9aae1e2b37fcee034 Mon Sep 17 00:00:00 2001
From: Eric Larson <larson.eric.d@gmail.com>
Date: Sat, 2 Mar 2024 08:35:55 -0500
Subject: [PATCH] FIX: Try explicit copy

---
 mne/_fiff/tag.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mne/_fiff/tag.py b/mne/_fiff/tag.py
index e1ae5ae571a..145748f840a 100644
--- a/mne/_fiff/tag.py
+++ b/mne/_fiff/tag.py
@@ -202,8 +202,9 @@ def _read_matrix(fid, tag, shape, rlims):
         if matrix_coding == "sparse CCS":
             tmp_indices = fid.read(4 * nnz)
             indices = np.frombuffer(tmp_indices, dtype=">i4")
+            indices = np.array(indices, int)
             tmp_ptr = fid.read(4 * (ncol + 1))
-            indptr = np.frombuffer(tmp_ptr, dtype=">i4")
+            indptr = np.array(np.frombuffer(tmp_ptr, dtype=">i4"))
             if indptr[-1] > len(indices) or np.any(indptr < 0):
                 # There was a bug in MNE-C that caused some data to be
                 # stored without byte swapping
@@ -214,11 +215,12 @@ def _read_matrix(fid, tag, shape, rlims):
                     )
                 )
                 indptr = np.frombuffer(tmp_ptr, dtype="<i4")
+            indptr = np.array(indptr, int)
             data = csc_matrix((data, indices, indptr), shape=shape)
         else:
             assert matrix_coding == "sparse RCS", matrix_coding
             tmp_indices = fid.read(4 * nnz)
-            indices = np.frombuffer(tmp_indices, dtype=">i4")
+            indices = np.array(np.frombuffer(tmp_indices, dtype=">i4"), int)
             tmp_ptr = fid.read(4 * (nrow + 1))
             indptr = np.frombuffer(tmp_ptr, dtype=">i4")
             if indptr[-1] > len(indices) or np.any(indptr < 0):
@@ -231,6 +233,7 @@ def _read_matrix(fid, tag, shape, rlims):
                     )
                 )
                 indptr = np.frombuffer(tmp_ptr, dtype="<i4")
+            indptr = np.array(indptr, int)
             data = csr_matrix((data, indices, indptr), shape=shape)
     return data