diff --git a/magick/threshold.c b/magick/threshold.c
index 1a57b05..2c07fb1 100644
--- a/magick/threshold.c
+++ b/magick/threshold.c
@@ -200,19 +200,19 @@
sync;
register const IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register const PixelPacket
- *__restrict p;
+ *restrict p;
register IndexPacket
- *__restrict threshold_indexes;
+ *restrict threshold_indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -391,13 +391,13 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -577,13 +577,13 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -726,7 +726,7 @@
i;
register PixelPacket
- *__restrict q;
+ *restrict q;
q=image->colormap;
for (i=0; i < (long) image->colors; i++)
@@ -752,13 +752,13 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -1482,13 +1482,13 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -1704,14 +1704,14 @@
sync;
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
id,
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -1778,14 +1778,14 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
id,
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;
@@ -2005,13 +2005,13 @@
for (y=0; y < (long) image->rows; y++)
{
register IndexPacket
- *__restrict indexes;
+ *restrict indexes;
register long
x;
register PixelPacket
- *__restrict q;
+ *restrict q;
if (status == MagickFalse)
continue;