diff --git a/include/ntfs/layout.h b/include/ntfs/layout.h
index f9f3ea7c..d2fa1a41 100644
--- a/include/ntfs/layout.h
+++ b/include/ntfs/layout.h
@@ -524,7 +524,7 @@ typedef enum {
  *	unistr.c::ntfs_collate_names() and unistr.c::legal_ansi_char_array[]
  *	for what I mean but COLLATION_UNICODE_STRING would not give any special
  *	treatment to any characters at all, but this is speculation.
- * COLLATION_NTOFS_ULONG - Sorting is done according to ascending u32	key
+ * COLLATION_NTOFS_ULONG - Sorting is done according to ascending u32 key
  *	values. E.g. used for $SII index in FILE_Secure, which sorts by
  *	security_id (u32).
  * COLLATION_NTOFS_SID - Sorting is done according to ascending SID values.
diff --git a/libntfs/unix_io.c b/libntfs/unix_io.c
index 5cfbeee0..ee8d35db 100644
--- a/libntfs/unix_io.c
+++ b/libntfs/unix_io.c
@@ -90,9 +90,11 @@ static int ntfs_device_unix_io_open(struct ntfs_device *dev, int flags)
 		return -1;
 	/*
 	 * Open the device/file obtaining the file descriptor for exclusive
-	 * access.
+	 * access (but only if mounting r/w).
 	 */ 
-	*(int*)dev->d_private = open(dev->d_name, flags | O_EXCL);
+	if ((flags & O_RDWR) == O_RDWR)
+		flags |= O_EXCL;
+	*(int*)dev->d_private = open(dev->d_name, flags);
 	if (*(int*)dev->d_private == -1) {
 		err = errno;
 		goto err_out;