diff --git a/qa/pull-tester/run-bitcoind-for-test.sh.in b/qa/pull-tester/run-bitcoind-for-test.sh.in
index e186bd7a2..67318e5a4 100755
--- a/qa/pull-tester/run-bitcoind-for-test.sh.in
+++ b/qa/pull-tester/run-bitcoind-for-test.sh.in
@@ -1,32 +1,32 @@
 #!/bin/bash
 # Copyright (c) 2013 The Bitcoin Core developers
 # Distributed under the MIT/X11 software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 #
 DATADIR="@abs_top_builddir@/.bitcoin"
 rm -rf "$DATADIR"
 mkdir -p "$DATADIR"/regtest
 touch "$DATADIR/regtest/debug.log"
 tail -q -n 1 -F "$DATADIR/regtest/debug.log" | grep -m 1 -q "Done loading" &
 WAITER=$!
-PORT=`expr 10000 + $BASHPID % 55536`
+PORT=`expr 10000 + $$ % 55536`
 "@abs_top_builddir@/src/bitcoind@EXEEXT@" -connect=0.0.0.0 -datadir="$DATADIR" -rpcuser=user -rpcpassword=pass -listen -keypool=3 -debug -debug=net -logtimestamps -port=$PORT -whitelist=127.0.0.1 -regtest -rpcport=`expr $PORT + 1` &
 BITCOIND=$!
 
 #Install a watchdog.
 (sleep 10 && kill -0 $WAITER 2>/dev/null && kill -9 $BITCOIND $$)&
 wait $WAITER
 
 if [ -n "$TIMEOUT" ]; then
   timeout "$TIMEOUT"s "$@" $PORT
   RETURN=$?
 else
   "$@" $PORT
   RETURN=$?
 fi
 
 (sleep 15 && kill -0 $BITCOIND 2>/dev/null && kill -9 $BITCOIND $$)&
 kill $BITCOIND && wait $BITCOIND
 
 # timeout returns 124 on timeout, otherwise the return value of the child
 exit $RETURN