diff --git a/kokkos/io.cpp b/kokkos/io.cpp
index 2bd4b5d8..5447f167 100644
--- a/kokkos/io.cpp
+++ b/kokkos/io.cpp
@@ -230,7 +230,7 @@ Inputs read_CLI( int argc, char * argv[] )
 	input.simulation_method = HISTORY_BASED;
 	
 	// defaults to max threads on the system	
-	input.nthreads = omp_get_num_procs();
+	input.nthreads = 1;
 	
 	// defaults to 355 (corresponding to H-M Large benchmark)
 	input.n_isotopes = 355;