diff --git a/.ci_fedora.sh b/.ci_fedora.sh
index 0774000b9c..452afb4b7e 100755
--- a/.ci_fedora.sh
+++ b/.ci_fedora.sh
@@ -56,6 +56,7 @@ else
     . /etc/profile.d/modules.sh
     module load mpi/${1}-x86_64
     export OMPI_MCA_rmaps_base_oversubscribe=yes
+    export PRTE_MCA_rmaps_default_mapping_policy=:oversubscribe
     export TRAVIS=true
     export FLEXIBLAS=NETLIB
     cd
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 148b6e17db..1083c5e059 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,6 +28,7 @@ jobs:
       OMP_NUM_THREADS: ${{ matrix.config.omp_num_threads }}
       PYTHONPATH: ${{ github.workspace }}/tools/pylib
       OMPI_MCA_rmaps_base_oversubscribe: yes
+      PRTE_MCA_rmaps_default_mapping_policy: ":oversubscribe"
       MPIRUN: mpiexec -np
     strategy:
       fail-fast: true