diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b9afc2ad648601e55a9b71c0534d8fbb5629ae64..bd497da3fab7f7404654988ba7fff90e73cdfa90 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1916,7 +1916,7 @@ mac_MpiOnly_Dbg:
       WALBERLA_BUILD_WITH_MPI: "ON"
       WALBERLA_BUILD_WITH_OPENMP: "OFF"
       WALBERLA_BUILD_WITH_PYTHON: "ON"
-      OMPI_MCA_btl_vader_backing_directory: "/tmp"
+      OMPI_MCA_btl: "self,tcp"
    except:
       variables:
          - $DISABLE_PER_COMMIT_BUILDS
@@ -1929,7 +1929,7 @@ mac_MpiOnly:
       WALBERLA_BUILD_WITH_MPI: "ON"
       WALBERLA_BUILD_WITH_OPENMP: "OFF"
       WALBERLA_BUILD_WITH_PYTHON: "ON"
-      OMPI_MCA_btl_vader_backing_directory: "/tmp"
+      OMPI_MCA_btl: "self,tcp"
    except:
       variables:
          - $DISABLE_PER_COMMIT_BUILDS