diff --git a/include/graphblas/nonblocking/init.hpp b/include/graphblas/nonblocking/init.hpp
index e01b17e70..f53ad0fb1 100644
--- a/include/graphblas/nonblocking/init.hpp
+++ b/include/graphblas/nonblocking/init.hpp
@@ -28,6 +28,7 @@
 #ifndef _H_GRB_NONBLOCKING_INIT
 #define _H_GRB_NONBLOCKING_INIT
 
+#include <omp.h>
 #include <graphblas/base/init.hpp>
 #include <graphblas/utils/DMapper.hpp>
 
@@ -134,7 +135,7 @@ namespace grb {
 				 * The maximum number of threads available in the system.
 				 */
 				static size_t numThreads() {
-					return num_threads;
+					return omp_get_max_threads();
 				}
 
 		};
diff --git a/src/graphblas/nonblocking/init.cpp b/src/graphblas/nonblocking/init.cpp
index b2f786983..c9957fc2a 100644
--- a/src/graphblas/nonblocking/init.cpp
+++ b/src/graphblas/nonblocking/init.cpp
@@ -38,7 +38,7 @@ bool grb::internal::NONBLOCKING::warn_if_not_native = true;
 bool grb::internal::NONBLOCKING::manual_tile_size = false;
 size_t grb::internal::NONBLOCKING::manual_fixed_tile_size =
 	grb::config::ANALYTIC_MODEL::MIN_TILE_SIZE;
-size_t grb::internal::NONBLOCKING::num_threads = grb::config::OMP::threads();
+size_t grb::internal::NONBLOCKING::num_threads; // = grb::config::OMP::threads();
 
 template<>
 grb::RC grb::init< grb::nonblocking >(