diff --git a/easybuild/easyconfigs/e/ELSI/ELSI-2.11.0-foss-2023a-PEXSI.eb b/easybuild/easyconfigs/e/ELSI/ELSI-2.11.0-foss-2023a-PEXSI.eb
index 1ac711b9cf5..a1be84f6de9 100644
--- a/easybuild/easyconfigs/e/ELSI/ELSI-2.11.0-foss-2023a-PEXSI.eb
+++ b/easybuild/easyconfigs/e/ELSI/ELSI-2.11.0-foss-2023a-PEXSI.eb
@@ -38,6 +38,10 @@ build_internal_pexsi = True
 
 configopts = '-DENABLE_BSEPACK=ON '
 
+# Tests use 4 MPI ranks, they require a minimum of 4 cores 
+# Map each MPI process to a single CPU core to avoid tests fails
+pretestopts = "export OMPI_MCA_rmaps_base_mapping_policy=slot:PE=1 && "
+
 runtest = True
 
 moduleclass = 'math'