diff --git a/MagickCore/quantize.c b/MagickCore/quantize.c
index 85c6488..c863e0c 100644
--- a/MagickCore/quantize.c
+++ b/MagickCore/quantize.c
@@ -564,7 +564,7 @@
continue;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
@@ -1519,7 +1519,7 @@
if (status == MagickFalse)
continue;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
@@ -1784,7 +1784,7 @@
*/
exception=(&image->exception);
q=GetCacheViewAuthenticPixels(image_view,p->x,p->y,1,1,exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
return(MagickFalse);
AssociateAlphaPixel(image,cube_info,q,&pixel);
for (i=0; i < ErrorQueueLength; i++)
@@ -2372,7 +2372,7 @@
if (status == MagickFalse)
continue;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
@@ -3265,7 +3265,7 @@
continue;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;
@@ -3339,7 +3339,7 @@
if (status == MagickFalse)
continue;
q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
- if (q == (const Quantum *) NULL)
+ if (q == (Quantum *) NULL)
{
status=MagickFalse;
continue;