diff --git a/MagickCore/threshold.c b/MagickCore/threshold.c
index ac754e5..af85140 100644
--- a/MagickCore/threshold.c
+++ b/MagickCore/threshold.c
@@ -204,7 +204,7 @@
   image_view=AcquireCacheView(image);
   threshold_view=AcquireCacheView(threshold_image);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(guided) shared(progress,status)
+  #pragma omp parallel for schedule(static,4) shared(progress,status)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {