diff --git a/scripts/tests/dns-etc-resolvconf.sh b/scripts/tests/dns-etc-resolvconf.sh
index 19c62bb3c..5f5437438 100755
--- a/scripts/tests/dns-etc-resolvconf.sh
+++ b/scripts/tests/dns-etc-resolvconf.sh
@@ -40,7 +40,7 @@ echo "# Make sure it's going through the tunnel"
 client_nslookup "$HTTPBIN" | grep "100\\.96\\.0\\."
 
 echo "# Make sure a non-resource doesn't go through the tunnel"
-client_nslookup "github.com" | grep -v "100\\.96.\\0\\."
+(client_nslookup "github.com" | grep "100\\.96.\\0\\.") && exit 1
 
 echo "# Stop the gateway and make sure the resource is inaccessible"
 docker compose stop gateway