diff --git a/test_tools/ci_test.sh b/test_tools/ci_test.sh
index a42eaa980ca0b5619935c7f6aa530b9ab2e7c304..701e020b7eab408cc9949cb192f72184e6f860dc 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
 }