diff --git a/o/OpenMPI/OpenMPI-4.1.4-GCC-11.3.0-CUDA-11.7.0.eb b/o/OpenMPI/OpenMPI-4.1.4-GCC-11.3.0-CUDA-11.7.0.eb
index 3908b03f..8c66e006 100644
--- a/o/OpenMPI/OpenMPI-4.1.4-GCC-11.3.0-CUDA-11.7.0.eb
+++ b/o/OpenMPI/OpenMPI-4.1.4-GCC-11.3.0-CUDA-11.7.0.eb
@@ -1,5 +1,5 @@
-# IT4Innovations 2022
-# JK
+# IT4Innovations
+# LK 2023
 
 name = 'OpenMPI'
 version = '4.1.4'
@@ -74,6 +74,8 @@ if os.environ.get("CLUSTERNAME") in ["BARBORA"]:
 elif os.environ.get("CLUSTERNAME") in ["KAROLINA"]:
    modextravars = {'OMPI_MCA_btl_openib_if_include': 'mlx5_0',
                 'OMPI_MCA_orte_base_help_aggregate': '0',
+                'UCX_IB_GPU_DIRECT_RDMA': '1',
+                'UCX_MEM_CUDA_HOOK_MODE': 'none',
    }
 else:
    modextravars = {'OMPI_MCA_btl_openib_if_include': 'mlx4_0',