diff --git a/magick/effect.c b/magick/effect.c
index 2992453..5740e1a 100644
--- a/magick/effect.c
+++ b/magick/effect.c
@@ -2658,7 +2658,7 @@
   register ssize_t
     i;
 
-  pixel_list=(MedianPixelList *) AcquireQuantumMemory(1,sizeof(*pixel_list));
+  pixel_list=(MedianPixelList *) AcquireMagickMemory(sizeof(*pixel_list));
   if (pixel_list == (MedianPixelList *) NULL)
     return(pixel_list);
   (void) ResetMagickMemory((void *) pixel_list,0,sizeof(*pixel_list));