diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 86604e2dffcc21f2aded3b38114ffdf0f0cc552d..f8f1fbcb28a0f8213a8b9bdec9dbcb7a6b69f8b4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -45,6 +45,7 @@ build:centos6.6:
   image: centos:6.6
   script:
   - echo "Building on CentOS 6..."
+  - rm -fr build-ci/
   - cmake .. -DENABLE_MM=1
              -DOPEN_MM_LIBRARY=$EBROOTOPENMM/lib/libOpenMM.so
              -DOPEN_MM_PLUGIN_DIR=$EBROOTOPENMM/lib/plugins