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-rw-r--r--win32/win32.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/win32/win32.c b/win32/win32.c
index 34ad5fedb1..9b069e588d 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -4843,13 +4843,13 @@ rb_w32_read_reparse_point(const WCHAR *path, rb_w32_reparse_buffer_t *rp,
}
else { /* IO_REPARSE_TAG_MOUNT_POINT */
static const WCHAR *volume = L"Volume{";
- /* +4/-4 means to drop "\??\" */
+ enum {volume_prefix_len = rb_strlen_lit("\\??\\")};
name = ((char *)rp->MountPointReparseBuffer.PathBuffer +
rp->MountPointReparseBuffer.SubstituteNameOffset +
- 4 * sizeof(WCHAR));
+ volume_prefix_len * sizeof(WCHAR));
ret = rp->MountPointReparseBuffer.SubstituteNameLength;
*len = ret / sizeof(WCHAR);
- ret -= 4 * sizeof(WCHAR);
+ ret -= volume_prefix_len * sizeof(WCHAR);
if (ret > sizeof(volume) - 1 * sizeof(WCHAR) &&
memcmp(name, volume, sizeof(volume) - 1 * sizeof(WCHAR)) == 0)
return -1;