diff --git a/tests/mpi/eckit_test_mpi.cc b/tests/mpi/eckit_test_mpi.cc
index cb900e2d6..6ce7e5961 100644
--- a/tests/mpi/eckit_test_mpi.cc
+++ b/tests/mpi/eckit_test_mpi.cc
@@ -8,6 +8,7 @@
  * does it submit to any jurisdiction.
  */
 
+#include <algorithm>
 #include <fstream>
 #include <numeric>
 
@@ -955,6 +956,8 @@ CASE("test_probe") {
         --count;
     }
 
+    std::sort(begin(data), end(data));
+
     for (int i = 0; i < nproc; i++) {
         EXPECT(i == data[i]);
     }
@@ -1000,6 +1003,8 @@ CASE("test_iProbe") {
         --count;
     }
 
+    std::sort(begin(data), end(data));
+
     for (int i = 0; i < nproc; i++) {
         EXPECT(i == data[i]);
     }