diff --git a/MagickCore/effect.c b/MagickCore/effect.c
index 59b7ece..af69767 100644
--- a/MagickCore/effect.c
+++ b/MagickCore/effect.c
@@ -2166,7 +2166,7 @@
   image_view=AcquireCacheView(image);
   blur_view=AcquireCacheView(blur_image);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(static,4) shared(progress,status) omp_throttle(1)
+  #pragma omp parallel for schedule(static,1) shared(progress,status)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {
@@ -3794,7 +3794,7 @@
   image_view=AcquireCacheView(image);
   spread_view=AcquireCacheView(spread_image);
 #if defined(MAGICKCORE_OPENMP_SUPPORT)
-  #pragma omp parallel for schedule(static,4) shared(progress,status) omp_throttle(1)
+  #pragma omp parallel for schedule(static,1) shared(progress,status)
 #endif
   for (y=0; y < (ssize_t) image->rows; y++)
   {