diff --git a/release/docker/docker-entrypoint.sh b/release/docker/docker-entrypoint.sh
index c5b0d4148095afaedc55ad53bfc79d9d742ded13..cc834de7df2727665a44077b853eb9e7fccf173a 100755
--- a/release/docker/docker-entrypoint.sh
+++ b/release/docker/docker-entrypoint.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 set -uo pipefail
 
-function boolean () {
+boolean () {
   echo "$1" | sed -E 's/^(true|yes|1)$/true/i'
 }
 big_fat_warning='\033[01;31m**WARNING**:\033[0m'