diff --git a/CHANGELOG.md b/CHANGELOG.md
index e110583..cdd6f50 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 
 # 4.4.1
 
+* Fix issue with AWS Secret Key containing a slash (fix elabftw/elabftw#4471)
 * Fix `set_real_ip` nginx module not working with CIDR notation
 
 # 4.4.0
diff --git a/src/init/prepare.sh b/src/init/prepare.sh
index ac252f5..9e55b19 100755
--- a/src/init/prepare.sh
+++ b/src/init/prepare.sh
@@ -342,8 +342,8 @@ populatePhpEnv() {
     sed -i -e "s#%SITE_URL%#${site_url}#" /etc/php81/php-fpm.d/elabpool.conf
     # assume that if ak is set, then sk is too
     if [ -n "$aws_ak" ]; then
-        sed -i -e "s/%ELAB_AWS_ACCESS_KEY%/${aws_ak}/" /etc/php81/php-fpm.d/elabpool.conf
-        sed -i -e "s/%ELAB_AWS_SECRET_KEY%/${aws_sk}/" /etc/php81/php-fpm.d/elabpool.conf
+        sed -i -e "s|%ELAB_AWS_ACCESS_KEY%|${aws_ak}|" /etc/php81/php-fpm.d/elabpool.conf
+        sed -i -e "s|%ELAB_AWS_SECRET_KEY%|${aws_sk}|" /etc/php81/php-fpm.d/elabpool.conf
     else
         sed -i -e "/%ELAB_AWS_ACCESS_KEY%/d" /etc/php81/php-fpm.d/elabpool.conf
         sed -i -e "/%ELAB_AWS_SECRET_KEY%/d" /etc/php81/php-fpm.d/elabpool.conf