diff --git a/scripts/install b/scripts/install
index 830465417bab67afa7e9105bcec690688f85f0c8..95b977af680916b703e8520e8953baf10fbffc0a 100755
--- a/scripts/install
+++ b/scripts/install
@@ -1,6 +1,6 @@
 #!/bin/bash -eux
 
-PG_PASSWORD=`tr -dc A-Za-z0-9_ < /dev/urandom | head -c 20 | xargs`
+PG_PASSWORD=`cat /dev/random | base64 | head -c 20 | xargs`
 
 echo "DISCOURSE_SMTP_ADDRESS=${MAIL_HOST}" > env
 echo "DISCOURSE_SMTP_PORT=587" >> env