diff --git a/training/kunlunxin/cpm-pytorch/config/environment_variables.sh b/training/kunlunxin/cpm-pytorch/config/environment_variables.sh
index 6bac80921..e3977276b 100644
--- a/training/kunlunxin/cpm-pytorch/config/environment_variables.sh
+++ b/training/kunlunxin/cpm-pytorch/config/environment_variables.sh
@@ -16,6 +16,7 @@ touch topo_file
 export XPUSIM_TOPOLOGY_FILE=$(readlink -f $topo_file)
 
 ## workaround due to ccix bug
+export BKCL_PCIE_RING=1
 export ALLREDUCE_ASYNC="0"
 export ALLREDUCE_FUSION="0"
 export BKCL_FORCE_SYNC=1