diff --git a/openmp/tools/multiplex/tests/lit.cfg b/openmp/tools/multiplex/tests/lit.cfg
index a637d6f72f552..459250582ae95 100644
--- a/openmp/tools/multiplex/tests/lit.cfg
+++ b/openmp/tools/multiplex/tests/lit.cfg
@@ -90,7 +90,7 @@ if 'Linux' in config.operating_system:
 
 # substitutions
 config.substitutions.append(("FileCheck", "tee %%t.out | %s" % config.test_filecheck))
-config.substitutions.append(("%sort-threads", "sort --numeric-sort --stable"))
+config.substitutions.append(("%sort-threads", "sort -n -s"))
 
 config.substitutions.append(("%libomp-compile-and-run", \
     "%libomp-compile && %libomp-run"))