diff --git a/script/test b/script/test
index 6700b5f1f..8cfea40f8 100755
--- a/script/test
+++ b/script/test
@@ -192,7 +192,7 @@ do_cert()
     fi
 
     [[ ! -d tmp ]] || rm -rvf tmp
-    PYTHONUNBUFFERED=1 "$1"
+    PYTHONUNBUFFERED=1 "$@"
 }
 
 do_cert_suite()
@@ -555,11 +555,13 @@ main()
                 ;;
             cert)
                 shift
-                do_cert "$1"
+                do_cert "$@"
+                shift $#
                 ;;
             cert_suite)
                 shift
                 do_cert_suite "$@"
+                shift $#
                 ;;
             get_thread_wireshark)
                 do_get_thread_wireshark