diff --git a/testdata/auth_load_rpz.tdir/auth_load_rpz.pre b/testdata/auth_load_rpz.tdir/auth_load_rpz.pre
index bde19cff4..da0c6fa69 100644
--- a/testdata/auth_load_rpz.tdir/auth_load_rpz.pre
+++ b/testdata/auth_load_rpz.tdir/auth_load_rpz.pre
@@ -5,7 +5,6 @@
 [ -f .tpkg.var.test ] && source .tpkg.var.test
 
 . ../common.sh
-get_random_port 2
 # if no threads; exit
 if grep -e "define HAVE_PTHREAD 1" -e "define HAVE_SOLARIS_THREADS 1" -e "define HAVE_WINDOWS_THREADS 1" $PRE/config.h; then
 	echo "have threads"
@@ -13,6 +12,7 @@ else
 	skip_test "no threads"
 fi
 
+get_random_port 2
 UNBOUND_PORT=$RND_PORT
 FWD_PORT=$(($RND_PORT + 1))
 echo "UNBOUND_PORT=$UNBOUND_PORT" >> .tpkg.var.test