1 files changed, 1 insertions, 1 deletions
diff --git a/src/undo.c b/src/undo.c
index 2eedfe31ab3..df1b82ff759 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -412,7 +412,7 @@ Return what remains of the list.")
  GCPRO2 (next, list);
  /* Don't let read-only properties interfere with undo.  */
-  if (NILP (current_buffer->read_only))
+  if (!NILP (current_buffer->read_only))
    specbind (Qinhibit_read_only, Qt);
  while (arg > 0)

diff --git a/src/undo.c b/src/undo.c index 2eedfe31ab3..df1b82ff759 100644 --- a/src/undo.c +++ b/src/undo.c
@@ -412,7 +412,7 @@ Return what remains of the list.")
412	GCPRO2 (next, list);	412	GCPRO2 (next, list);
413		413
414	/* Don't let read-only properties interfere with undo. */	414	/* Don't let read-only properties interfere with undo. */
415	if (NILP (current_buffer->read_only))	415	if (!NILP (current_buffer->read_only))
416	specbind (Qinhibit_read_only, Qt);	416	specbind (Qinhibit_read_only, Qt);
417		417
418	while (arg > 0)	418	while (arg > 0)