diff --git a/admin_manual/installation/nginx-root.conf.sample b/admin_manual/installation/nginx-root.conf.sample
index f4ffe9b7f..d82881841 100644
--- a/admin_manual/installation/nginx-root.conf.sample
+++ b/admin_manual/installation/nginx-root.conf.sample
@@ -44,7 +44,7 @@ server {
     # will add the domain to a hardcoded list that is shipped
     # in all major browsers and getting removed from this list
     # could take several months.
-    #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
+    #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload" always;
 
     # set max upload size and increase upload timeout:
     client_max_body_size 512M;
diff --git a/admin_manual/installation/nginx-subdir.conf.sample b/admin_manual/installation/nginx-subdir.conf.sample
index 79f37a41f..f0abad771 100644
--- a/admin_manual/installation/nginx-subdir.conf.sample
+++ b/admin_manual/installation/nginx-subdir.conf.sample
@@ -45,7 +45,7 @@ server {
     # will add the domain to a hardcoded list that is shipped
     # in all major browsers and getting removed from this list
     # could take several months.
-    #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
+    #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload" always;
 
     location = /robots.txt {
         allow all;