diff --git a/MagickCore/thread-private.h b/MagickCore/thread-private.h
index 2623d52..f30b82f 100644
--- a/MagickCore/thread-private.h
+++ b/MagickCore/thread-private.h
@@ -29,15 +29,7 @@
Single threaded unless workload justifies the threading overhead.
*/
#define MinimumWorkLoad() (32*GetMagickResourceLimit(ThreadResource))
-#define dynamic_num_threads_uno(colors) \
- if ((colors) > MinimumWorkLoad()) \
- num_threads(GetMagickResourceLimit(ThreadResource))
-#define dynamic_num_threads_dos(columns,rows) \
- if (((((columns) > MinimumWorkLoad()) || \
- ((rows) > MinimumWorkLoad()))) && ((MagickSizeType) \
- ((columns)*(rows)) > (MinimumWorkLoad()*MinimumWorkLoad()))) \
- num_threads(GetMagickResourceLimit(ThreadResource))
-#define dynamic_num_threads_tres(columns,rows,expression) \
+#define dynamic_number_threads(columns,rows,expression) \
if (((((columns) > MinimumWorkLoad()) || \
((rows) > MinimumWorkLoad()))) && ((MagickSizeType) \
((columns)*(rows)) > (MinimumWorkLoad()*MinimumWorkLoad())) && \