diff --git a/test_tools/ci_test.sh b/test_tools/ci_test.sh
index bdfc40d1674e9de503384a5860b5ce31f8a03764..9abaca530c441716570166624c29f8c9b01e34cd 100644
--- a/test_tools/ci_test.sh
+++ b/test_tools/ci_test.sh
@@ -361,7 +361,9 @@ EOF
     run_test
     test_result_ana
 
-    echo ${br_nf_iptab_num} | sudo tee /proc/sys/net/bridge/bridge-nf-call-iptables
+    if [ -e /proc/sys/net/bridge/bridge-nf-call-iptables ]; then
+        echo ${br_nf_iptab_num} | sudo tee /proc/sys/net/bridge/bridge-nf-call-iptables
+    fi
 
     exit $exitCode
 }