diff --git a/package/debian/postinst b/package/debian/postinst
index 4f0d036668..05daa43d5a 100755
--- a/package/debian/postinst
+++ b/package/debian/postinst
@@ -81,7 +81,7 @@ case "$1" in
     addUser thehive "" thehive "thehive daemon-user" "/bin/false"
     # Generate secret key
     if ! test -e /etc/thehive/secret.conf; then
-      key=$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 64 | head -n 1)
+      key=$(dd if=/dev/urandom bs=1024 count=1 | tr -dc 'a-zA-Z0-9' | fold -w 64 | head -n 1)
       echo "play.http.secret.key=\"$key\"" > /etc/thehive/secret.conf
     fi
 
@@ -99,4 +99,4 @@ case "$1" in
     echo "postinst called with unknown argument \`$1'" >&2
     exit 1
   ;;
-esac
\ No newline at end of file
+esac
diff --git a/package/docker/entrypoint b/package/docker/entrypoint
index cbf58c58ff..2f355f0668 100755
--- a/package/docker/entrypoint
+++ b/package/docker/entrypoint
@@ -81,7 +81,7 @@ then
   then
     if test -z "${SECRET}"
     then
-      SECRET=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 64 | head -n 1)
+      SECRET=$(dd if=/dev/urandom bs=1024 count=1 | tr -dc 'a-zA-Z0-9' | fold -w 64 | head -n 1)
       test "${SHOW_SECRET}" = 1 && echo Using secret: ${SECRET}
     fi
     echo "play.http.secret.key = \"${SECRET}\"" >> ${CONFIG_FILE}