diff --git a/test_tools/ci_test.sh b/test_tools/ci_test.sh
index e0e896779c1383dbf3752023f542010e876db249..e609b2757930840a0bde0a41d1f6d4e5ce4bfb20 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
 }