diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 57f7481..0594a16 100644
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -1384,7 +1384,7 @@
           continue;
         if ((convolve_traits & CopyPixelTrait) != 0)
           {
-            const size_t
+            size_t
               center;
 
             center=((image->columns+width)*width/2)*channels+i;