diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index de78aea8fd96fdc1e651af5379978c1e360377cd..1290ed98787377eea7d54f12d05b94eff0aeaf2f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -161,6 +161,9 @@ testing_stage:
       - python3 ../../src/scripts/pycompare.py --ffile=$FFILE --cfile=c_OCLU --html
       - echo "Testing cluster with 24 spheres"
       - ./np_cluster ../../test_data/cluster/DEDFB_24 ../../test_data/cluster/DCLU_24 .
+      - echo "Comparing output of CLUSTER with 24 spheres"
+      - export FFILE=../../test_data/cluster/OCLU_24
+      - python3 ../../src/scripts/pycompare.py --ffile=$FFILE --cfile=c_OCLU --html
       - echo "Checking consistency among legacy and HDF5 configuration files"
       - ../testing/test_TEDF ../../test_data/cluster/DEDFB_24 c_TEDF c_TEDF.hd5
       - echo "Checking consistency among legacy and HDF5 TM files"