diff --git a/bitcoind.run b/bitcoind.run
index 640ba46..8f0abd3 100644
--- a/bitcoind.run
+++ b/bitcoind.run
@@ -3,7 +3,7 @@
 export HOME="/var/lib/bitcoind"
 
 # gen random pw for rpc server
-RANDOMPW=$(tr -dc 'a-f0-9' < /dev/urandom | head -c20)
+RANDOMPW=$(openssl rand -hex 20)
 
 cat <<EOF > $HOME/bitcoin.conf
 rpcuser=${BITCOIND_RPCUSER:-rpcuser}