diff --git a/test_fms/horiz_interp/test_create_xgrid_order2.sh b/test_fms/horiz_interp/test_create_xgrid_order2.sh
index eb962ac42..6076ee3eb 100755
--- a/test_fms/horiz_interp/test_create_xgrid_order2.sh
+++ b/test_fms/horiz_interp/test_create_xgrid_order2.sh
@@ -29,5 +29,5 @@
 . ../test-lib.sh
 
 
-test_expect_success "create_xgrid order2" './test_create_xgrid_order2_r8'
+test_expect_success "create_xgrid order2" 'mpirun -n 1 ./test_create_xgrid_order2_r8'
 test_done