Index: sources/test_regression/15042009c/system.cpp
===================================================================
--- sources/test_regression/15042009c/system.cpp	(revision 56)
+++ sources/test_regression/15042009c/system.cpp	(revision 60)
@@ -32,4 +32,7 @@
     const long long int ca = 0xf00000000LLU;
     a = ca;
+
+    // Setup number of threads open-mp to 1 with the macro threads_omp()
+    threads_omp();
 
     test_t<param_t> test1, test2;