diff --git a/netcdf.spec b/netcdf.spec
index f22dacd..70108db 100644
--- a/netcdf.spec
+++ b/netcdf.spec
@@ -250,6 +250,8 @@ done
 # Set to 1 to fail if tests fail
 fail=1
 make -C build check || ( cat build/*/test-suite.log && exit $fail )
+# Allow openmpi to run with more processes than cores
+export OMPI_MCA_rmaps_base_oversubscribe=1
 for mpi in %{mpi_list}
 do
   module load mpi/$mpi-%{_arch}